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    ·         What is a metal detector?

    ·         Who invented a metal detector?

    ·         Where are metal detectors used?

    ·         Types of metal detectors

    ·         The art of metal detecting tips

    ·         Common settings and terms available in metal detectors

What is a metal detector?

Metal detectors are electronic instruments which predict the presence of metals nearby. They help people find metal object buried underground or hidden within objects. They consist of a handheld unit and a sensor probe that is used to sweep over the ground. If the detector comes across a metal, it produces a tone.Metal Detector by silverdetector

A simple metal detector consist of an oscillator that produce an alternating current passing through a coil producing alternating magnetic fields here. If any electrically conductive metal get close to the coil, a currents is induced in the metal producing a magnetic field of its own.

lt’s important to know that metal detectors do not detect nonmetal materials such as pearls, bones, paper, gemstones or stone figures.

Who invented a metal detector?

The first metal detector was invented in 1881 by Alexander Graham Bell after the assassination of President James Garfield Alexander invented a crude metal detector in a bid to locate the bullet as the president lay dying. Although the detector did not help him save the president, it fueled the ambition to create a functional one.

Where are metal detectors used?

The first industrial metal detector was developed in 196os and were mainly used in mining and other industrial prospects.

Other uses include detection of land mines, detection of weapons such as guns and knives, archeology and treasure hunting. They can also be used to detect foreign materials in foods and in construction to detect presence of steel reinforcing bars in concrete and pipes buried in the floor.

Types of metal detectors

Walk through detectors

These are common in military installations and public buildings, security screening at courthouses, airports or prison access points They are simple to use as they only have two large coils and a handle and small speaker.

Hand carried detectors

These are small handles enough to be hand held. They are mostly used at security checkpoints. some units have been developed to be carried by pedestrians scanning for metal objects such as nails or landmines in the ground.

Gradiometer Detector

a gradiometer is used to measure gradient. Gradiometer metal detectors are walk though devices but are limited to detecting only ferromagnetic objects. They can also be mounted on police cars with the intent of detecting ferromagnetic weapons such as guns approaching the cars.

Magnetic imaging portals

Magnetic imaging is new technology in metal detection that uses radio frequency electromagnetic waves and displays the result of the scan on a screen. However, it does not produce a detailed image but only reveals the location and the approximate size.

The art of metal detecting tips

How you swing your metal detector is very important. If you swing your detector too fast, it will not pick smaller target because it did not have enough time to pick the disturbance in the ground. Additionally, if you swing the detector far off the ground, it will not pick deep targets especially if the detector is of high frequency.

Just like any other practice metal detecting is guided by laws and regulations. You cannot go metal detecting in private property without a permission National parks and states are off limit. Beaches, parks and schools are going to be dependent on local laws.

This may sound vague but digging is part of metal detecting. Use the right tools for digging and make sure to cover your hole appropriately. Minimize damage on the ground so that the area of digging can return to its original state quicker.

lt’s important to note that things that have been buried for long can be hard to detect since they are more likely to have corroded or oxidized

Before acquiring a metal, detector make sure that you know where it will be used as different metal detectors are used in different scenarios. Make sure to read detectors manuals carefully as understanding the proper settings, capabilities and technology used in metal your metal detector is the first important step towards metal detecting.

Below is a guide on some common settings and terms used in metal detectors:

Discrimination

This is the ability of a metal detector to distinguish between different targets. When doing a metal detecting exercise, you are likely to come across things such as rusty nails and battle caps. A metal detector should be able to differentiate between a bottle cap and a piece of copper so as to save on time digging up garbage.

Ground balance

Soil contain a certain level of metal such as iron. These metals can interfere with your detectors ability to detect coins and jewelry among other valuables in the soil. Ground balance enable the detector to bypass these materials. It's important to note that detectors come with several ground balance variations

Automatic: This allows for detection and adjustment for ground effects automatically

Preset: This is a predetermined level of ground balance by the manufacturer. The level works adequately in most environments

Manual: This variation allows for on-site adjustment by the user as per the changes in the ground condition.
Multiple: This allows the user to select either manual or automatic setting depending on their preference.

Target identification

This is the best tool in a metal detector. It can distinguish between coins like nickel, penny, foil or the probability of gold. It then gives a high pitched audible tone for valuables and a low tone for junk. Frequently, the target ID is visual and is displayed on the LCD display screen.

Operating frequency
Metal detectors frequency is the number of times a signal is transmitted and received by the detector every second. Most general purpose detectors operate with lower frequencies as lower frequencies scan go deeper giving out a better overall detection depth.

On the other side, high frequency detectors are more sensitive to gold and small objects however they are less able to penetrate deeper into the ground.

Sensitivity
This is the ability of a detector to detect metal objects form a distance. This can be explained using a volume control example. If its set too low, it cannot be hard, but if it‘s set too high, the sound gets distorted. It is therefore necessary to lower detectors sensitivity to the recommended levels.

Search depth

Search depth is the depth which a metal detector can search for metals. Lower frequency detectors go for deeper depth while high frequency detectors don't go deeper. Soil composition and search coil can also have an impact on search depth too. The larger the coil, the deeper it goes. You can mostly find coins to a depth of one and half times the search coil diameter. For example, if you are using an 8-inch search coil, you can typically find coins at 8 - 13 inches.

Looking for the best metal detector for a beginner will likely be overwhelming for a beginner. There are numerous brands, models, and other options to pick from. Being familiar with what to search for will make this a simpler process.

Some of the things that are likely to affect your choice about what the best beginner metal detector are the cost, the features, and how you plan to utilize the detector. If you're planning to use the metal detector for gold prospecting detector or in water you may want one specialized for those needs. But for almost all beginners, a general-purpose detector likely will be what you want.

All you need to know come up with a budget. A top-grade metal detector may cost many thousands of dollars, while a beginner metal detector is able to be had for much less. Expect to commit to at least $1 OO-$150 for a decent metal detector. Any metal detectors priced less than this will probably disappoint you in their performance. For $100-$150 you can get a detector which is plenty for many beginner detectors needs. They are going to simple, which often can be advantageous for a beginner, but will most likely lack many features of more expensive metal detectors.

Several of the most popular beginner detectors sell for about MOO-$300. They have become well liked because around this price point you are able to attain some of the features that more professional metal detectors have, but at an inexpensive price. You will find detectors inside of this price range with features such as depth indicators, target ID's, and pinpointing. As you continue to rise in price you can expect to attain more features with your detector.Meta by silverdetector

Listed below are some of the features which might interest you when you're looking for the best metal detector.

Pinpointing

This is certainly a feature that many people find quite handy. After you have discovered a target, you can utilize a pinpoint feature to help you determine the exact spot in the ground that the target is. This makes it easier to extract the object and will help you to dig much smaller holes. There are other techniques for you to do this, such as by swinging the detector over the item from several directions or also by using a handheld

pinpointer, but a lot of people prefer using the pinpoint function in their detector-

Target ID

Detectors with a target lD feature help you to know the type of item that the target is before you dig. These generally put targets into categories like iron, foil, nickel, tab, zinc penny, dime, and quarter. This is very valuable for helping you to reduce spending valuable time digging things you are not interested in. It's really advantageous in trashy areas where there are numerous pull tabs or iron targets. Good detectors will

possess some way to discriminate between these different types of metals.

Do keep in mind though that target ID's are not perfect. A good deal of trash definitely will show up in categories that you will want to dig and quite a few good targets are going to be in ranges which tend to be garbage. For example, pull tabs often can display in the nickel category, and gold items should display in the same range as pull tab, nickel, foil, and iron.

Ground Balancing

Some ground contains a great deal of iron and other minerals which can confuse a detector. The signals from the soil can be stronger than the signal from the target causing the metal detector to be challenging or impossible to use. Ground balancing is a feature that erases the effects of the minerals in the ground. This is a feature that many beginner metal detectors don't have, and for most beginning metal detectorists this most likely isn't necessary. But if you reside in a highly mineralized area it might be a good feature to have.
Depth Indicator

Some metal detectors will have an indicator on them which displays to you exactly how deep a target is under the ground. This is very valuable for discovering how deep of a hole you must be digging in order to retrieve the item.

Choosing a metal detector should be done very carefully. Take a look at what type of metal detecting you are likely to be doing and the terrain you will be hunting in. Get the best, most versatile machine your budget will allow and then go have some fun! If metal detecting turns out to be something you want to get serious about, you can always upgrade your metal detector later, when your skills have improved.

The first question lingering in your mind is how a metal detector works or how it developed, well below you will find the answers. A metal detector is an electronic device used to detect buried metallic objects.

These detectors use electromagnetic fields to detect metallic materials that are magnetic. Metal detectors exist in a variety of configuration, there can be handheld or even walk through models. These detectors are used in airports, schools, libraries, shopping malls, court rooms, and any other secured place. Apart from this, metal detectors are used to unearth mines and find ancient artifacts. The development of this revolutionary tool started back in the 193 OS before the second world war started. A polish officer, Josef Stanislavsky, refined the design of the metal detector into a practical tool. The metal detector only comprises of a few components that include; a control box, a shaft, and a coil.

A Detailed Guide

There are three types of metal detectors:

1. Very low frequency (VFL)

2. Pulse induction (Pl)

3. Beat-frequency oscillation (BFD)

The VFL detector contains a coil at the end of the shaft known as a transmitter coil. The battery transmits an electrical current to the transmitter coil. This creates a magnetic field that interacts with any metallic material that is magnetic. There is also a second coil connected to a speaker. Whenever the detector is passing over a metallic object, there is a beep. VLF detectors can cost anywhere between $300 to $1000.

A pulse Induction detector operates using a single coil. This coil serves as both the receiver and the transmitter. The PI detector operates by sending strong brief pulses of current through the wire coil. These short pulses generate a magnetic field that changes polarity when then pulse dies away. PI detectors are more expensive since they are rare. They cost over $1000 with some models costing as much as $3000. BFO detectors have two coils, one is within the control box while the larger coil is in the head attached to a shaft. The two coils connected to an oscillator that produces bursts of current.
There is an offset in the frequencies of the pulses/bursts produced between the two coils. These pulses produce radio waves, and a receiver in the control box picks up the waves. The radio waves are audible and they vary with the frequency. Prices for BFO detectors range from $500 to $1000.Metal Detector by silverdetector


Tips on How To Use A Metal Detector

Using a metal detector to find metallic objects straight forward; The first step if you are a beginner is to identify the metal detector of your choice. Do extensive online research and find out which metal detector works for you. Once you get the metal detector, get to understand how it works and the various settings. Analyze yourself in terms of where you want to do your metal hunting. The reason behind this is that various metal detectors are designed to work different environments. For instance, some detectors are great to use on the beach while others are better in the woods.

Learn the proper way to swing your metal detector; slow swings are preferred. Ensure your detector is close to the ground as much as possible without touching it. Slow swings ensure that your detector is able to detector smaller targets with accuracy.

Once you have a target, dig with minimal disruption; remove a small portion of grass and make a plug. After extraction of the metallic object put back the soil and the grass. This ensures that the grass grows again with ease.

Use the right tools for the job for an easier experience that is enjoyable. Digging while kneeling can take a toll on your knees, knee pads come handy in such a situation. Carry a bottle of water, you can be out on the field for long hours. A small shovel comes handy while digging small holes. Gloves come handy in preventing blisters on your hands, they also protect you from sharp objects. Safety goggles are essential to keep your eyes safe from small particles.

Problems Solved by Metal Detectors

Metal detectors have made it easier to find buried mines that are then safely disposed of saving lives. They have improved security in public spaces since people are screened using metal detectors as they enter this space. So, learn about metal detector by these tips.

Myths Associated with Metal Detectors

Some of the popular myths about metal detectors include;

1. Metal detectors can be used anywhere that you feel is appropriate. There are restrictions on government land and historical sites

2. Metal detectors use x-ray; as discussed earlier, they use electromagnetic currents.

3. It is only experts that find valuable stuff; this is not true, anyone can be lucky.

Apart from the myths, there are controversies that surround the use of metal detector. Some of the laws may not make sense and may seem oppressive. For example, using metal detectors on people may seem or feel intrusive and uncomfortable.

Metal detectors are used for mineral hunting at the beach. The secret to successful hunting is a prior knowledge on the minerals and a quality metal detector. Salty water and hot rocks pose a problem during the treasure hunting exercise. It causes land based metal detectors to chatter and sends false signals. Consider buying a low-frequency metal detector which comes with a ground adjust control. This feature helps in tuning

the level of mineralization on the beach.

A quality metal detector for beach activities features a very low frequency and ground adjusts control feature. Pulse induction technology protects the detector from mineral effects. There are many models out there in the market which makes the selection process quite overwhelming. We shall cover some of the best models and give an insight on things to look for while purchasing one.Metal by silverdetector

Garrett AT Pro

This metal detector can be used both in freshwater and saltwater. It is designed with water proof features up to 10 feet deep. Garrett AT Pro is perfect for shoreline and shallow water activities. There are three standard modes for beginners and three pro modes for experienced users. This affordable device is easy to set up and use. A pro mode audio feature provides a beep sound for mineral detection. It is also designed with High-Res iron discrimination feature for mineral selection. AT Pro weighs 5 pounds which are light enough for carrying along the beach.

Fisher 1280-X Aquanaut

It's a deep seeking and submersible metal detector with automatic operation features. Fisher 1280 is great for land, saltwater and freshwater use. VF discrimination technology ensures that only minerals are detected. It’s designed with target strength LED and a quartz circuit which provides extended battery life. It's easy to use with on and off power and volume buttons. Aquanaut is waterproof up to 250 feet deep. It offers target audio and visual response.

XP DEUS Wireless Metal Detector

XP DUES represents the next generation of metal detectors. This wireless model offers internet and PC compatibility. A wireless coil, headphones and a controller offer a new detecting experience. It's very fast and sensitive with a coil operating at a frequency range between 4 and 18Khz. Iron audio and reactivity settings allow you to detect minerals in all environments. It comes with custom programs to meet your specific needs.

Tesoro Sand Shark Metal Detector

Tesoro employs Pulse Induction technology which makes it an ultra-fast metal detector. It blocks changes in salt water conductivity. VCD and normal are two distinct operating modes which are linked to different sounds. The former provides a loud and high-pitched sound which is great for pinpointing. The latter has a

single tone for beachcombing and prolonged hunting. A microprocessor allows you to customize your metal detector. It is waterproof up to 200 feet and offers up to 20 hours of battery life.

Minelab Excalibur Il Metal Detector

Excalibur II is designed with broad band spectrum technology which offers great rejection capabilities great for underwater use. A unique design allows you to use this model both in and out of the water. It's waterproof up to 200 feet deep. The ground canceling technology helps in rejecting false signals while hunting minerals in the salt water. Excalibur II amplifies weak signals and reduces noise. It makes use of NiMH rechargeable battery which offers up to 12 hours of battery life.

Things to Consider

 Your success in treasure hunting highly depends on the choice of your metal detector. First, learn about the area of your target in terms of minerals deposits. Then proceed to choose a compatible metal detector. Make sure to choose a water proof detector for use in deep waters. Metal detectors which are approved for salty water environment are the most preferred. Your detector should be able to detect minerals in deep waters. Consider the material construction which has implications on weight. A lightweight metal detector can be carried for long distances and can be used for long hours. Mineral information is well-presented by a digital display. A quality metal detector for beach activities should be able to block trash signals. Consider the battery life and display options. The sound produced and noise mitigation is also important.

Conclusion

Quality metal detectors offer better mineral hunting experience both in freshwater and saltwater environments. Choose a metal detector which is easy to use. Consider its discrimination capabilities, water proof features, audio technology and battery life. The above models guarantee better performance for your activities at the beach.

If you are buying a metal detector for the first time, and you don't know how to choose the right one, don't worry. Metal detectors aren't actually that complicated. The basic mechanism behind their construction is actually simple, and involves one or two coils to generate the necessary electromagnetic frequencies to detect metals and other similar items.

 

What makes one metal detector different from anther comes down to three things:

    ·         Its Type

    ·         Who is meant to use it?

    ·         Its Cost

 So, if you take these three issues into consideration then you should have no trouble choosing the ideal metal detector for your needs. To help you do this, here are three tips that you may find useful.Metal Detector by silverdetector

Which Type of Detector Do You Need?

The first thing you need to consider is the type of metal detector you want. Different detectors have different features, and you will need to consider each of these features carefully if you want to buy the ideal metal detectors.

Here are several examples of different types of metal detectors;

Beat Frequency Oscillation Detectors - Relatively weak devices, these types of metal detectors can be found in most electronics stores, so you should have no trouble finding them. They can locate metallic object buried up to two feet underground, and they feature coils which are connected to special oscillators that generate the necessary frequencies to locate buried metallic objects.

Very Low Frequency Detectors –

These types of detectors feature pairs of coils that work together to generate highly accurate and sensitive frequencies. Their transmitter coils work by looping powerful magnetic fields into the ground, which then create magnetic currents whenever they encounter metallic objects. Very low frequency detectors are similar to beat frequency oscillator detectors, but generally offer better results.

Pulse Induction Detectors –

These detectors are relatively new to the market, and are typically employed by security personnel to detect weapons and other types of contraband. They use echolocation technology to detect metallic objects, and have only one coil instead of the usual two that most other detectors use. The only problem with these kinds of detectors is that because they were designed for military and law enforcement purposes, they are not as efficient at detecting ordinary metals as other types of detectors. However, if you want a security metal detector then this is your best option.

Industrial Metal Detectors –

Finally, there are industrial metal detectors, and they are large, non-portable devices that use electromagnetism to detect metallic objects. The most common yariant are doorframe detectors, which are commonly found at airports and other high-security facilities. These devices aren't useful for treasure hunting, but they are handy if you want to better secure a home or business establishment.

Who is Going to Use the Detector?

The next issue that you will need to consider is the type of people who are supposed to use the metal detector. How old are they? How often do they need to use the detector? Do you want a metal detector that can also be used by your friends or do you want something that can be used by your entire family? So, if you wish to buy the detector for your exclusive personal use then there's nothing to worry about. However, if you want others to use it, or you need it for a specific project then you will need to think about your options.

For example, if you want to buy a family detector then you should pick one that either has a short or adjustable pole, as that will allow children to use the device. On the other hand, if the detector is meant for a person with a disability then find one that has some special features, like an adjustable arm cup, which is quite suitable for such users.

Furthermore, if the detector is meant for people who travel around then you should look for one that has some portable features, such as those that have removable boards and controls. Also, there are some metal detectors that come with their own special containers, so that you can disassemble them for easy storage and transport. These kinds of features are useful for those who are interested in treasure hunting, because they allow you to carry your metal detector for extended periods of time.

So even though different metal detectors are designed using similar principles, it's important to remember that some of them are more suited for certain types of users than others. Keep that in mind when you are ready to buy your metal detector.

How Much Are You Willing to Spend on Your Metal Detector?

Last but not least is the price is issue. How much are you willing to spend on your metal detector? The cost of automatic metal detectors with full features have gone down in recent years, but there are still plenty of variations. If you want the best metal detectors, with top of the line features then you may need to set aside between $300 to $500. For these prices, you can expect a lot of nice features, some of which you may or may not actually need, depending on where or how you use your detector. Also, more expensive detectors have stronger signals, and can detect metals four or more feet underground.

Less expensive detectors can cost between $175 to $2?5, and for this price, you can expect good performance and reliable controls, but not much else, so don't expect a lot of bells and whistles. This wouldn't be an issue if you just want to use the detector for casual treasure hunting. However, if you want your detector to find items buried deeper than 2 feet then you will need to buy a more expensive detector.

Also, there are the accessories to think about. Many metal detectors come with plenty of accessories, including:

    ·         Trowels

    ·         Coil Covers

    ·         Cleaning Equipment

    ·         Storage Devices

    ·         Scoop Headphones
These items can cost about a hundred dollars in total. Sometimes, they come as part of the detector, while in other cases, their inclusion is optional. So, before you buy a detector, you should also consider the cost of their accessories.

    ·         What is a metal detector?

    ·         Who invented a metal detector?

    ·         Where are metal detectors used?

    ·         Types of metal detectors

    ·         The art of metal detecting tips

    ·         Common settings and terms available in metal detectors

What is a metal detector?

Metal detectors are electronic instruments which predict the presence of metals nearby. They help people find metal object buried underground or hidden within objects. They consist of a handheld unit and a sensor probe that is used to sweep over the ground. If the detector comes across a metal, it produces a tone.Metal Detector by silverdetector

A simple metal detector consist of an oscillator that produce an alternating current passing through a coil producing alternating magnetic fields here. If any electrically conductive metal get close to the coil, a currents is induced in the metal producing a magnetic field of its own.

lt’s important to know that metal detectors do not detect nonmetal materials such as pearls, bones, paper, gemstones or stone figures.

Who invented a metal detector?

The first metal detector was invented in 1881 by Alexander Graham Bell after the assassination of President James Garfield Alexander invented a crude metal detector in a bid to locate the bullet as the president lay dying. Although the detector did not help him save the president, it fueled the ambition to create a functional one.

Where are metal detectors used?

The first industrial metal detector was developed in 196os and were mainly used in mining and other industrial prospects.

Other uses include detection of land mines, detection of weapons such as guns and knives, archeology and treasure hunting. They can also be used to detect foreign materials in foods and in construction to detect presence of steel reinforcing bars in concrete and pipes buried in the floor.

Types of metal detectors

Walk through detectors

These are common in military installations and public buildings, security screening at courthouses, airports or prison access points They are simple to use as they only have two large coils and a handle and small speaker.

Hand carried detectors

These are small handles enough to be hand held. They are mostly used at security checkpoints. some units have been developed to be carried by pedestrians scanning for metal objects such as nails or landmines in the ground.

Gradiometer Detector

a gradiometer is used to measure gradient. Gradiometer metal detectors are walk though devices but are limited to detecting only ferromagnetic objects. They can also be mounted on police cars with the intent of detecting ferromagnetic weapons such as guns approaching the cars.

Magnetic imaging portals

Magnetic imaging is new technology in metal detection that uses radio frequency electromagnetic waves and displays the result of the scan on a screen. However, it does not produce a detailed image but only reveals the location and the approximate size.

The art of metal detecting tips

How you swing your metal detector is very important. If you swing your detector too fast, it will not pick smaller target because it did not have enough time to pick the disturbance in the ground. Additionally, if you swing the detector far off the ground, it will not pick deep targets especially if the detector is of high frequency.

Just like any other practice metal detecting is guided by laws and regulations. You cannot go metal detecting in private property without a permission National parks and states are off limit. Beaches, parks and schools are going to be dependent on local laws.

This may sound vague but digging is part of metal detecting. Use the right tools for digging and make sure to cover your hole appropriately. Minimize damage on the ground so that the area of digging can return to its original state quicker.

lt’s important to note that things that have been buried for long can be hard to detect since they are more likely to have corroded or oxidized

Before acquiring a metal, detector make sure that you know where it will be used as different metal detectors are used in different scenarios. Make sure to read detectors manuals carefully as understanding the proper settings, capabilities and technology used in metal your metal detector is the first important step towards metal detecting.

Below is a guide on some common settings and terms used in metal detectors:

Discrimination

This is the ability of a metal detector to distinguish between different targets. When doing a metal detecting exercise, you are likely to come across things such as rusty nails and battle caps. A metal detector should be able to differentiate between a bottle cap and a piece of copper so as to save on time digging up garbage.

Ground balance

Soil contain a certain level of metal such as iron. These metals can interfere with your detectors ability to detect coins and jewelry among other valuables in the soil. Ground balance enable the detector to bypass these materials. It's important to note that detectors come with several ground balance variations

Automatic: This allows for detection and adjustment for ground effects automatically

Preset: This is a predetermined level of ground balance by the manufacturer. The level works adequately in most environments

Manual: This variation allows for on-site adjustment by the user as per the changes in the ground condition.
Multiple: This allows the user to select either manual or automatic setting depending on their preference.

Target identification

This is the best tool in a metal detector. It can distinguish between coins like nickel, penny, foil or the probability of gold. It then gives a high pitched audible tone for valuables and a low tone for junk. Frequently, the target ID is visual and is displayed on the LCD display screen.

Operating frequency
Metal detectors frequency is the number of times a signal is transmitted and received by the detector every second. Most general purpose detectors operate with lower frequencies as lower frequencies scan go deeper giving out a better overall detection depth.

On the other side, high frequency detectors are more sensitive to gold and small objects however they are less able to penetrate deeper into the ground.

Sensitivity
This is the ability of a detector to detect metal objects form a distance. This can be explained using a volume control example. If its set too low, it cannot be hard, but if it‘s set too high, the sound gets distorted. It is therefore necessary to lower detectors sensitivity to the recommended levels.

Search depth

Search depth is the depth which a metal detector can search for metals. Lower frequency detectors go for deeper depth while high frequency detectors don't go deeper. Soil composition and search coil can also have an impact on search depth too. The larger the coil, the deeper it goes. You can mostly find coins to a depth of one and half times the search coil diameter. For example, if you are using an 8-inch search coil, you can typically find coins at 8 - 13 inches.

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