Components of Metal Detectors You Should Know Before Buying

Components of Metal Detectors You Should Know Before Buying

We all know that metal detectors are electronic devices. They consist of components that improve the quality of the device.

Some components make it easier to use and work with. A metal detector user must know its components to achieve optimized results.

In this article, we will discuss the components of metal detectors in detail. Users should understand the working and purpose of each component of the device.

This understanding will help make the device user-friendly, allowing the user to get the most out of it and its parts.

To get the most out of an electronic device and fix problems, you should understand it well. That’s why knowing what is inside your device and how to deal with it is necessary.

Learn About The Components Of Metal Detectors

There are twelve components of a metal detector that we will discuss below.

Control Unit

The control unit is the central part of the metal detector, just like a computer has a central processing unit.

The control unit handles all the signal-processing processes, which is why it is an essential part of the detector and is known as the brain of the device.

It is kept above the ground so that it does not get damaged while swinging the device. Some devices have portable control units that can be easily carried in a pocket.

The exterior of the control unit is made of plastic and sometimes has a rubberized finish. The size of the control unit varies depending on the technology, whether it’s the latest or traditional.


The coil of the detector is a hardware part used to emit electromagnetic signals underground. It is located at the lower part of the detector as it comes into contact with the soil.

It should be kept 2 to 3 inches above the soil to avoid any damage from stones, wires, or other particles. If the coil gets damaged, the device will no longer function. So, one should be very careful while swinging the device above the ground.

Coils come in different sizes and shapes, determining the depth potential of the device. The larger the coil, the greater the depth potential.

There are different types of metal detector sensors/coils that you should know.

If you have purchased your detector then you must know How to test a metal detector coil.


A shaft is a component of a metal detector that connects the coil of the device with the control unit. It gives structure and shape to the device, making it user-friendly.

Shafts are not electrical parts. They are sticks that help make the device strong.

Shafts are removable parts, and the user can adjust their length according to a comfortable height. These lightweight components support the detector for easy swinging.


The armrest is also a structural component of metal detectors. It is a C-shaped component that can be fixed onto the user’s arm. Users can easily swing the device with the aid of the armrest, which also helps in avoiding irregular device movements.

Display Screen

The output produced by metal detectors can be black and white or colored. Metal detector screens or displays can be either analog or digital.

Analog devices have needles or knobs, while digital devices have buttons or touch screens. 

Advanced devices also provide 3D displays, representing the output in the form of graphs or shapes. This allows the user to have an idea about the detected target object before digging.


Speakers are also an important part of the device, as the output produced by metal detectors is in the form of audio signals or tones.

Depending on the model, some speakers produce loud or high-pitched sounds, while others produce low or light sounds.

Users can also adjust the tones according to their desire and comfort. The volume of the tones can also be increased or decreased as per the users’ requirements.


Metal detectors are designed for outdoor activities. Some devices cannot be recharged, but others have rechargeable batteries, like a phone.

Some devices use disposable batteries such as 9-volt, AA, or AAA batteries. Users can have some extra disposable batteries with them so that when one battery runs out, it can be replaced with another. Some people like rechargeable batteries, while others prefer disposable ones based on their needs.


Metal detectors have a backlight. When you switch on the light, the display will illuminate, allowing you to easily read in the dark or at night.

Some devices have a built-in torch, while others provide it separately along with the device. It helps the user when metal detecting in the dark or at night.

Covers and Protectors

Metal detectors are outdoor devices, so the user must protect them from the outside terrain and environment. Some devices are not water-resistant, so the coil and control unit of the device must be protected from water splashes in rainy weather.

Manufacturers have produced covers and protectors for this purpose. They come in different sizes, materials, and shapes.

Some covers are see-through, while others are made of fabric. Users can cover their devices with these protectors to protect them from dust, scratches, and water splashes.

Buttons or Knobs

Buttons and knobs are used to input information into the device. You can change the settings of the device by using buttons and knobs. Modern devices have a touch option for adjusting settings, while old analog devices use knobs for settings.


Sometimes users work in an area where privacy is necessary or they do not want to attract unnecessary attention. Headphones are used in such cases when the place is crowded and you do not want to disturb other people.

Headphones are used to listen to inaudible signals more clearly. Some manufacturers provide headphones along with the device, while others do not.

Some devices can also work with headphones used with PCs or mobile phones. Many modern devices also have the feature of enabling wireless headphones.


Many metal detectors have a built-in pinpointer, but some require the user to buy a separate one. Pinpointers can precisely locate the target object without moving the device. So, it can be a built-in component of the device or an additional accessory.

What is a pinpointer for metal detecting, and why should every detectorist have one?


We have discussed the major components of metal detectors. Users must know every component of the device for a better understanding of the device. By understanding each part of the device, the user can maximize its performance and resolve any future problems with the device.

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