An underwater metal detector is an electronic device that detects the existence of any metallic substance at close range. It is commonly used in the world today in the walk through areas to detect guns, bombs and knives due to the increasing rate of terrorism. It makes a high-pitched sound when it’s run at close range to the metal. The nearer the metal is the higher the sound of the detector.
Underwater Metal Detector Types
An underwater metal detector is simply a metal detector that is used underwater mostly under seas or oceans. They can also be used in fun and games like treasure and underwater hunting along the beach. There are two types available in underwater metal detectors that are widely used today; these are:
- Very low-frequency metal detectors (VLF)
- Pulse induction metal detectors (PI)
Very Low-Frequency Metal Detectors
This detector mainly operates in the 3-30 kHz frequency. They have very high sensitivity towards metallic substances like coins and jewelry. These detectors can separate junk metals from another type of relevant metals. Due to its high sensitivity, it is affected by minerals that are rampantly found in the field, and therefore, needs to be controlled to suit the users’ specific needs. To do so, one needs to adjust the ground balance control; this will help to prevent interference by ground minerals.
A few examples of the best VLF metal detectors found in the market today are
- Fisher CZ-21 Metal Detector
- Tesoro Tiger Shark
- Fisher 1280-X Aquanaut metal detector with 10” Coil
- Garrett AT Pro
Pulse Induction Metal Detector
These metal detectors are very sensitive to precious metals, unlike VLF detectors; they are not affected by soil minerals, sand or wet salt. It works by transmitting electronic pulses in the ground. Since it is not affected by wet salt or ground minerals, a pulse induction metal detector is the best for using in salty water bodies and also for diving. Unlike the VLF, it has no capability of separating trash and irrelevant objects from a stash. This makes it difficult to locate precious objects. A few examples of the best PI metal detector in the market today are-:
- Garrett Infinium LS
- JW Fisher Pulse 8X
- Tesoro Sand Shark
- Garrett Sea Hunter Mark II
The Difference Between Underwater Metal Detectors and Others
- Water proof – Normal metal detectors are not waterproof. Underwater metal detectors need to be waterproof to prevent rust on the metal. This is because some of the metal detectors are used in large salty water bodies, and salty water is known to be an excellent platform for rust.
- Pitch – An ordinary metal detector will identify the presence of metal nearby by sounding a high pitch. The closer and heavier the metal is the higher the pitch of the metal detector. An underwater metal detector, on the other hand, will not have this characteristic. This is because; sound does not travel in water medium rendering this characteristic useless. Instead, it will have a needle on a meter that will detect the level of any metallic content once the metal is brought close to it. However, due to recent technology, under water metal detectors come with waterproof headphones that block out all the unnecessary noise in the environment. This makes it quite easier for the user to hear a pitch made by the detector once it comes close to any metallic object.
- Weight – The weight of a typical metal detector will vary from that of an underwater detector. An under water metal detector will be lighter in weight as compared to the standard detector. This is because the diver will need to carry the metal detector in the deep sea to locate any precious metals. It would be manufactured in a way that will not make it too heavy to make the diver sink, or too light for it to easily float away once in the water.
- Power Source – The power source found in a normal metal detector will differ from an underwater metal detector. A standard metal detector will use a normal battery that will maybe need to be charged daily or weekly depending on the usage of the detector. An underwater metal detector, on the other hand, will have a special kind of power source that has been designed specifically to be used inside the water. It would specifically be designed for deep sea and salty water bodies. A regular battery will not work in water, and that will render the instrument useless.
- Quality – regarding quality, the underwater metal detector will be of better quality. This is because the manufacturers will take more time to design it and build it to be suitable for use under water. The materials that will be put together in the assembling of this instrument will be of high quality. The price of manufacture will have to go hand in hand with the price of the instrument. Since the materials used will be expensive, the selling price will also have to be costly. The vice versa is true for standard metal detectors. The typical metal detector, on the other hand, will not use super quality materials as compared to the underwater detector. This is because it does not need very special attention as it can be used by anyone after little or no training.
- Cost – Due to the high-quality material used to make it, the underwater metal detector will obviously be more expensive to purchase as compared to the standard metal detector. The average metal detector will be more affordable as it is manufactured by less expensive materials, and its production cost is much lower than the production cost of the under water metal detectors.
- Usage – The usage of these two detectors will differ; the underwater metal detector will need training before using it. It is mostly used by deep sea divers who are well trained and can easily manipulate it. However, thanks to technology today, the use of the underwater metal detector have been made much easier with the aid of a manual. The usual metal detector, on the other hand, is much simpler to use, needs little or no training and can easily be used by anyone at any walk in the station. It is mainly used by security at any walk in the station to detect guns and knives because of the increase in crime rates in the world today.
Underwater Metal Detecting Tips
Owning it is one thing, using it is another. Knowing where and how to use an underwater metal detector will help in choosing the right kind when it comes to purchasing. The underwater metal detector may not only necessarily be used by divers in the deep sea. The deep sea divers mainly use this detector in looking for capsized ships, relics and lost treasure. The underwater metal detectors used by divers in the deep sea have got much-advanced features as compared to the usual metal detector which is used for fun and games along the beach by families and other adventurous people. There are less sophisticated detectors that can be used for fun and games along the beach. These can be used in water where the level is knee high or up to the waist. The basic tips in using the under water metal detectors are:
- Water proof headphones – Having water proof head phones helps in listening to any metal detection from a distance depending on how good the detector is. The headphones block out any external noises that may interfere with hearing any noise made by the metal detector.
- Tank and snorkel – This will come in handy. A tank and snorkel will aid in breathing, depending on how deep the diver would want to go. One might not need a tank if he/she is only going to a knee-high level.
- Waterproof watch – This is needed in most cases by deep sea Deep sea divers need to carry air tanks when going deep into the sea to aid them in breathing under water. At some point, the tank needs run out of the air, and the diver will need to go back to the surface of the water so as to exchange his/her tank. To ensure that air does not run out on you without your knowledge, a waterproof watch is needed to time the length of time under water by the air tank.
- Carry Bag – A carry bag for the metal detector becomes helpful especially if you need it along the beach or if you are using your detector in the knee-high water. It keeps the detector secure and prevents the entry of sand particles inside the detector.
- Tracking device – For divers, having a tracking device installed in the metal detector is necessary. This will ensure that the rest of the deep sea divers stay in touch with you and can easily find you once you are not in sight. In some cases, where the diver gets lost in the deep sea, it will help the search team to find them by using this tracking device.
Technology is hastily growing by the day, and new equipment is being developed overnight. Metal detectors that were only and mostly used in industries have now been greatly modified and are used by almost anyone. Metal detectors are also used for security reasons in Airports, Ports, train and bus stations. They are mostly used for security purposes to detect guns, bombs and knives.
Buying your first underwater metal detector can be an uphill task especially if you don’t know what you’re looking for. However, to make sure that you don’t make a blind purchase that might end up being a burden to you in the long run here are a short underwater metal detector reviews of best underwater metal detectors that you should seriously look into.
Sand Shark Underwater Metal Detector by Treasure Hunter
The sand shark underwater metal detector is a slender and lightweight metal detector that can be used by both starters and those that are looking for something that is not too basic or too complex. With a simple design and layout, it is a metal detector that is quite easy to use but very handy.
Some of the features that come with this metal detector include pulse induction, the ability to discriminate small metal pieces, it comes with submersible headphones and has great discrimination features.
- Has a very flexible depth of up to 132 feet.
- Can work in both salty and fresh water.
- Is not complex to use.
- Is light yet sturdy.
- It is not completely waterproof.
- Does not do very well under water.
Treasure Hunter Aquavision Pro Diving Metal Detector
This is yet another lightweight and the sturdy metal detector that has a simple outlay and controls for those who are yearning for something that is functional yet not hefty on the pocket or tricky to operate.
It is very lightweight and weighs only 6 lbs. And comes with a five year warranty and submersible headphones for those that would like to do underwater treasure hunting. It also comes with discrimination features that allow you only to find what is necessary.
- Is lightweight and very convenient to carry around.
- Can work both on land and water and comes with submersible headphones to make the latter more efficient.
- Has a five year warranty as proof of quality.
- Does not do very well in areas with high concentration of salt.
- Is not entirely waterproof, and you may need a silicon sealant to make sure the equipment is not damaged by water.
Garrett Sea Hunter Mark II Underwater Metal Detector
This Garret sea hunter is an ideal addition to those that are looking to go treasure underwater hunting. It comes with the necessary equipment, and the best part is that it is built in a comfortable and light design that makes it ideal for underwater use.
It comes with a microprocessor unit and an advanced pulse discrimination capability that ensures that you only get what is valuable but also conserve your energy especially when it comes to digging out your findings. It also has a 3piece system design that comes with diving attachments to make it ideal for underwater use.
- It is simple and easy to operate.
- Is light weight making it quite easy to operate under water?
- It comes with a two-year warranty.
- Works equally well on dry land as it does on water.
- Goes off very easily making it tiresome because of constant digging.
- Requires you to use the machine for long to be able to discriminate the findings yourself.
Tesoro Tiger Shark Metal Detector
If you’re looking for something that is a little more advanced and can go deeper, then this is a metal detector that you should be looking for. Even though, it comes with a simple build; it comes with fully fledged features that make it quite the purchase and partner.
Some of the most standout features that come with the Tesoro Tiger Shark Metal Detector include; the full discrimination ability to make hunting and underwater metal detecting much easier and fun, waterproof headphones and interchangeable search coils.
- It is waterproof up to 200 feet deep.
- Has a lifetime warranty.
- The waterproof headphones make it very useful even underwater.
- Has long battery life.
- Is not ideal for the first-time users.
Deep Blue Underwater Treasure Hunting Metal Detector
For those that might be looking of something that can work the ground and water equally well then this utterly comfortable and light metal detector might be a good purchase for them. It might not be able to go as deep as some of the other competitors, but it does get the job done either way.
This is perhaps the most feature full metal detector on this list. Some of its features include being waterproof as deep as 65 feet underwater, has discrimination adjustments, comes with submersible headphones and also comes with a carry bag and an instructional manual.
- Is light weight.
- Comes with an instructions book and a carry bag.
- Is able to function in both fresh and salty water as well as dry land.
- The knobs are a bit hard to turn
- The packaging could be better.
Underwater Metal Detecting Tips – Bonus Video
If you’re looking to invest in a metal detector, these five could be a great place to start since they offer a balance between those who are looking for a professional product and those who are looking for an entry level product. This is more so the case for those who would take their underwater hunting expeditions.