Thinking about diversifying your scuba diving experience by adding an element of fun? Waterproof and underwater metal detectors are able to provide you with just that.
Using electromagnetism, waterproof and underwater metal detectors will quickly alert you to metal objects under the surface both on land or in the water. Regardless of whether you invest in a pulse or a very-low-frequency detector, you can expect it to give you a memorable experience (and possibly a new hobby).
Although most waterproof metal detectors have the same functionality, they differ in the following ways:
- The size of the search coil (which is closely linked to your chances of finding the sought-after treasure)
- The type (pulse induction (PI) detection vs. very low frequency (VLF) detection)
- The depth of water the device can safely be submerged under without stopping to work
- The availability of additional underwater audio support
To guide you in the right direction, we gathered a list of the best underwater metal detectors whose pros outweigh their cons. We suggest you carefully review the items listed below in order to find the best match for your needs.
BUYING GUIDE
Prior to purchasing an underwater metal detector, it is advised to take notes of a few characteristics that will help you differentiate one model from another. For you to avoid getting ripped off by a seller, consider paying attention to features like search coil size, detection type, water depth, and water + audio support.
HOW DO METAL DETECTORS WORK?
Metal detectors transmit an electromagnetic field through its search coil, sending energy to the area under the ground. Metal objects absorb this electromagnetism and begin transmitting a field of their own, which are received by the search coil. Different types of metal will transmit different types of signals, giving the user an idea of the kind of discovery over which they’re standing.
Check out underwater metal detecting in action here. The product used is one by Marinelab:
COIL SIZE
The rule of thumb states that the larger the search coil is, the higher the chance of you finding that underwater treasure. This is due to the higher level of sensitivity assigned to search coils with bigger dimensions that results in you spending less time exploring the sandy bottom of the ocean.
TYPE
Generally speaking, there are 2 types of underwater metal detectors – one uses pulse induction (PI) detection, while the other works with a very low frequency (VLF) detection type. The former tends to be more expensive than the latter, mainly due to their lack of sensitivity to minerals and is thus better for use in saltwater.
The VLF metal detectors, on the other hand, operate exceptionally in freshwater and have a great focus that helps you promptly find precious metals.
WATER DEPTH
The submersible stem underwater metal detectors are the easiest to use. For this reason, it’s best to choose the model that can go deep into the water without compromising any of its main functions. Metal detectors that can go deep will give you a higher chance of finding the valuables you are looking for.
WATER & AUDIO SUPPORT
If you are planning on using your underwater metal detector in salt water, it is crucial to get the model that supports this type of water. If it doesn’t, you are risking receiving false information and likely damaging your machine. Those with additional underwater audio support are an even better option as they seem to provide you with the most accurate findings.
Frequently Asked Questions about the Underwater Metal Detector
On-land metal detectors don’t cut it anymore – now they have to be submersible under the water. Besides, they better be exceptionally great at it, or unsatisfied customers will result in high returns.
The pressure is high – but so is the number of detectors offered by every retailer under the sun. Our extensive guide gives you a good run-down on the most practical underwater metal detectors available on the market. Here is a list of some of our favorites:
It’s not prohibited to use an underwater metal detector on land when searching over sand or dirt. Since they work well under the water, there’s no way they wouldn’t be able to operate on dry land.
That said, waterproof underwater metal detectors are known for weighing much more than their on-land counterparts. The manufacturers, therefore, have to use heavier elements to equip them with water-friendly features, which makes them considerably heavier.
Those who are skilled in metal detecting and diving will benefit the most from using an underwater metal detector while scuba diving. You will be able to easily submerse 200-feet deep into the water and discover the well-hidden beneath the surface riches.
The experience won’t be dangerous and neither will it be tricky as you are aware of how these machines work and have no trouble scuba diving.
If, however, you are new to either scuba diving or metal detecting, it might be a better idea to bring your skills to an appropriate level where you don’t need any supervision and are able to operate independently.
The weight of the underwater metal detector is important only to a certain degree – if you aim to use your machine on land, it will matter much more than if you are aiming at strictly using it under the water.
It can get difficult to operate an underwater metal detector on the ground as it will weigh you down, so this is a factor to take into consideration when deciding what tool to invest in.
The handheld models are an example of detectors that don’t need headphones to alert you about the new underground find – rather, they use vibrating frequencies or a display for this purpose.
Alternatively, the underwater metal detector models can either come with headphones (so that you don’t have to purchase them separately) or have a waterproof coil that helps you decipher the readings you receive from them. Both of these models can fully run by themselves without needing any other tools.


Take a moment to look at this.

No, not that I know of at least. There might be, but not on the scale we’re looking at.
Hello,
Just to have any idea about the right instruments.
Looking for any complete metal detector gold-oriented, to use from boat on the sea, till 100m deep.
The idea is the coil (or other device) stay at 0,5/1m far from the bottom sea, moving very slow with boat.
There is any technology that allow a distance scan?
Thanks to give me informations to understand better the problem.
Best,
What is the best frequency for an underwater detector? I notice some at 20, some at 7 some at 6. Is there one that has both Pulse and VLF? and doesn’t cost in the thousands?