The Best Underwater Metal Detector  - The Waterproof Options

Our #1 PICK 

Wedigout Metal Detector Waterproof Pinpointer

~ The Best Value for Money ~

  • Uses pulse induction technology
  • Can be submerged up to 30 meters underwater
  • Comes with a 12-month warranty
  • Uses both vibrating and light indicator

Hunting for coins and artefacts underwater is a fun albeit difficult task. That’s mainly because you need to have the proper equipment.

It's not just for diving either, to locate shiny metal things below the surface you need a good underwater metal detector.

In this article, we’ll explain how underwater metal detectors work as well some of the best metal detector models on the market nowadays. Let’s dive in!


Types of Underwater Metal Detectors

Before we get into the most important features of an underwater metal detector, let’s talk a bit about how these things work. There are two main types of metal detectors: Pulse Induction (PI) and Very Low Frequency (VLF) metal detectors [1].

PI metal detectors send electronic pulses to the ground. These pulses aren’t affected by water, sand or minerals, but they are by precious metals [2]. But because they’re highly sensitive, they’re also pricey. What’s more, they tend to be heavier, even though that doesn’t matter as much in the water.

VLF metal detectors, as the name suggests, use low frequency to locate treasure underground.

“As the magnetic field pulses back and forth into the ground, it interacts with any conductive objects it encounters, causing them to generate weak magnetic fields of their own.” - Jeff Tyson for HowStuffWorks.

VLF metal detectors are very sensitive, but that can also be a bad thing. If the ground is rich in magnetite and such, the metal detector will respond to it, giving you some false findings. The more sensitivity or ground balance adjustment controls a metal detector has, the more you can minimize signals caused by ground minerals. Generally, VLF metal detectors are a much cheaper alternative to PI detectors.


What to Look for in an Underwater Metal Detector

There isn’t a single best underwater metal detector on the market, so choosing the right model isn’t very straightforward. We’ve mentioned the two types of metal detectors, and the choice between them isn’t as simple either.

A PI metal detector will work better in seawater as no minerals will interrupt your signal. However, if you’re just starting out, buying one might be too much of a stretch for your wallet. In that case, a VLF metal detector with some control adjustment might be a better option. They’re also a good choice if you’re diving in freshwater.

Now let’s cover some most important features a good underwater metal detector needs to have.

Coil Size

The larger the coil on the metal detector is, the higher the chance of finding cool treasure underwater. The science behind it is pretty simple. A bigger dimension means it can cover more ground in a shorter amount of time. That’s not to say smaller coils aren’t as effective. It’s just that it takes you longer to go over the ground with them.

Water Depth

Not all metal detectors can go deep underwater. In fact, there are tons of models on the market that claim to be waterproof but can’t go more than 1 meter below the surface. For treasure hunting in water, these models are practically useless.

Some better models available can go up to 40 meters below the water surface. But if you’re just starting diving, a model that goes up to 10 meters might be enough.

Finding Indicators

Metal detectors use different methods to show they’ve located something, like vibration, light and sound. All three of these are fine on the ground, but when you’re submerged underwater, an audio indicator might not be ideal. With all the breathing equipment you’ll be wearing, hearing something else over the can be tough. In this case, a light indicator, especially when combined with another method, is the best option.


The 7 Best Underwater Metal Detectors in Australia Reviewed

With all these features in mind, we’ve selected a couple of waterproof metal detectors on the market that have everything you need to search for treasure below the water surface.

  • Uses pulse induction technology
  • Can be submerged up to 30 meters underwater
  • Comes with a 12-month warranty
  • Uses both vibrating and light indicator

Thanks to pulse induction technology, this metal detector can be used on practically any type of soil, both on land and in water. You can also use it on the black sand without it going crazy from magnetic mineralisation. Australian beaches do have black sand, but since it’s heavy, it’s layered under lighter coloured quartz. But with this detector, you don’t have to worry about your signal being disrupted.

The metal detector has an automatic tuning, so you don’t have to set up sensitivity yourself. It’s very simple to use. When it locates metal, the detector vibrates and flashes in white light. And as you come closer, light and vibration pulses become more frequent. You can go as deep as 30 meters to find cool things underwater.

Related: Best Metal Detector For Gold.

The metal detector is made of stainless steel, while the coil is covered with epoxy resin. This prevents it from corroding even from saltwater. The detector operates on a 9V battery, which has to be bought separately. The battery compartment has a compression seal, so there’s no way water can get in. Another great thing about this detector is that it’s so lightweight and compact, you can store it in almost any backpack and bring it along when going to the beach.

What we liked: 

  • Uses pulse induction technology
  • Can be submerged up to 30 meters underwater
  • Comes with a 12-month warranty
  • Uses both vibrating and light indicator

What we didn't like: 

  • The battery compartment hard to open

  • The colour of the light indicates the distance
  • Uses vibration as a finding indicator
  • 9V battery is included
  • Comes with a 2-year warranty

Just because you might not like diving too deep doesn’t mean you can’t enjoy searching for metal underwater. And in case you’re doing that in depths shallower than 10 meters, then you can use a pinpoint metal detector like this one by DR.ÖTEK.

This is a professional-quality metal detector that’s sold for a more than reasonable price. It’s completely waterproof and can be used in depths under 10 meters. The detector is powered by a 9V alkaline battery that comes included. Most models don’t come with one, so this is a plus.

This metal detector is simple to use. It has a single button, which makes it great for both adults and kids. It has a 4-level LED light that shows you the distance to the object you’ve located. The light changes from red to green, blue and white. Red indicates something that’s far away, while white means you’re close to the object. There’s no audio noise, so even if you use it out of the water, it won’t disturb people or wildlife around you.

Since it comes with a 2-year warranty, buying this metal detector is no risk. It has so many cool features, but if you end up not liking them, you can return it and get your money back.

What we liked: 

  • The colour of the light indicates the distance
  • Uses vibration as a finding indicator
  • 9V battery is included
  • Comes with a 2-year warranty

What we didn't like: 

  • Works better in fresh than saltwater

  • Works on a single button
  • Three indicator modes to choose from
  • Comes with a battery
  • Includes belt holster, carrying bag and hanging wire

For someone that likes exploring the water depths, a metal detector is a great birthday gift. Especially if it comes in a nice little set with all the things one might need. Whether you’re looking for a gift or buying a metal detector for yourself, this set by Sunpow is worth checking out.

This metal detector has a 360° detection area and can target objects accurately up to 10 centimetres. It can detect different metals underwater in depths up to 10 meters. To do that, all you need to do is press a single button. A long press turns the detector on and off while a shart press switches between modes.

This metal detector has three different modes: silent with vibration, audio and both at the same time. So whether you’re using it underwater or on the ground, you can choose the mode that’s most suitable for your current environment.

Aside from the pinpointer detector, the package also includes a few other things. You get a carrying bag, a 9V battery, a belt holster and a retractable hanging wire. So when you’re not using it, you can sheath it around your belt, hang it on your backpack or store it in its carrying bag.

What we liked: 

  • Works on a single button
  • Three indicator modes to choose from
  • Comes with a battery
  • Includes belt holster, carrying bag and hanging wire

What we didn't like: 

  • Short shutdown time

#4: Best for Deep Sea Diving: SuperEye 40 Meters Underwater Metal Detector

  • Can go up to 40 meters deep
  • Battery lasts for 20 hours
  • Comes with waterproof headphones
  • Very lightweight

Once you’re hooked on treasure hunting, you’ll probably switch to a more professional metal detector. These things go deeper and for a longer period, which gives you plenty of time to thoroughly search the bottom.

This metal detector by SuperEye can go as deep as 40 meters to search for underwater treasure. The large search coil is 22 centimetres wide and has a large adjustment range, so you can find treasure no matter how big or small. The metal detector features a recognition mode, so you can distinguish between different types of metal to find the one that you’re looking for. That way, you can always differentiate treasure from trash.

There are 3 colour LED indicators as well as audio mode, which tell you what you’ve found. This metal detector comes with waterproof headphones so you can use them even while exploring the sea depths.

This metal detector weighs only 2 kilograms, so it’s easy to hold and move. It has an ergonomic handle, so you can comfortably use it for up to 20 hours, which is the duration of the battery. It operates on a 9V battery, which doesn’t come with the purchase, so you have to buy it yourself.

What we liked: 

  • Can go up to 40 meters deep
  • Battery lasts for 20 hours
  • Comes with waterproof headphones
  • Very lightweight

What we didn't like: 

  • Pricey compared to most other models

#5: Best for Professionals: NALANDA Underwater Metal Detector

  • Goes up to 40 meters underwater
  • Battery lasts for 20 hours
  • Three alert options
  • A 12-month warranty

Searching around the bottom of the sea is fun until you realize there’s way more trash than treasure, especially in the depths an amateur is searching in. But thanks to the discrimination and selection features some metal detectors have, you can be more specific about what you’re searching for and find it more easily.

This Nalanda metal detector has three distinct modes that allow you to optimize your search. Just turn the knob left or right to choose between all metals and discrimination to search for ferrous or non-ferrous metals only.

There are two separate knobs that allow you to control sensitivity and search mode very easy when you’re submerged. The metal detector has three types of sound and light alerts for your findings. You can adjust the sensitivity to find precise locations of treasure. It can detect coin-sized things up to 20 centimetres deep, and larger buried metal objects up to 1.2 meters.

The metal detector can be used in depths up to 40 meters. The battery lasts for about 20 hours, which is more than enough time to enjoy treasure hunting. It works on a 9V battery, which has to be bought separately.

What we liked: 

  • Goes up to 40 meters underwater
  • Battery lasts for 20 hours
  • Three alert options
  • A 12-month warranty

What we didn't like: 

  • Very pricey

  • Most affordable option
  • Battery lasts for 48 hours
  • Three indicator modes
  • Comes with a belt holster and hanging wire

The majority of metal detectors on the market are rather expensive, which makes getting into treasure hunting difficult. If you’re only starting out, you don’t want to spend a lot of money before you realize if this activity is for you. In that case, you should find a budget-friendly option that performs well. Like this model by PudiBe.

The design of this metal detector is rather simple. It’s made of Polyvinyl Chloride, the same material used for making pipes in our houses. This material is durable and resistant to corrosion, so you can safely use it in salty water. This metal detector can be used in depths up to 10 meters, which is more than enough for people that have just started diving.

This metal detector has three modes: vibration, audio and the combination of the two. There are three sensitivity levels with different audio and vibration alerts that show you the distance between you and the object located.

As for the battery life, this metal detector wins among all the models on this list. The 9V battery keeps it working for up to 48 hours, which is way more than you’ll spend underwater in few days combined.

What we liked: 

  • Most affordable option
  • Battery lasts for 48 hours
  • Three indicator modes
  • Comes with a belt holster and hanging wire

What we didn't like: 

  • Not as sturdy as some other models

  • Low battery sensor tells you when it’s time to replace it
  • Huge loyal customer base
  • Excellent quality materials
  • Several sizes available
  • Can eliminate up to 90% of dog fur

While the weight of the metal detector doesn’t matter as much when underwater, the design definitely does. Having a free hand is practical, so a small and compact metal detector is a worthy investment.

This Shuogou metal detector weighs only 0.5 kilograms and it’s 50 centimetres long. It’s so small and lightweight, even your kids can use it. Thanks to the anti-skid handle, it sits comfortably in your hand. Plus it has a wrist wrap, so there’s no way you can accidentally drop it and watch it get lost at the bottom of the sea.

However, just because it’s tiny, it doesn’t mean it’s not strong. This metal detector works in depths up to 30 meters. When it locates a potential treasure, the detector sends signals with pulses of vibration and flashes of bright blue light, which you can see and feel underwater.

This metal detector works on a 9V battery that doesn’t come with the purchase. The battery goes into the compartment in the handle, which closes with a sealing knob. This prevents even a drop of water from entering.

What we liked: 

  • Low battery sensor tells you when it’s time to replace it
  • Very lightweight
  • Can go up to 30 meters underwater
  • Blue light is visible in any conditions

What we didn't like: 

  • The battery is not included

Final  Verdict

Currently, the Wedigout metal detector is the overall best underwater metal detector Australia has to offer. Thanks to pulse induction technology, you can use it in any type of soil, including black sand. It’s also lightweight, sturdy and can go up to 30 meters deep. And most importantly, it’s a good value for the price.

But as we said, the choice of the metal detector depends on the condition you’re going to use it in. If this model doesn’t work for you, there are six others on the list that surely have what you need.

FAQ

1.Can I use an underwater metal detector on the ground?

Yes, there’s absolutely nothing that prevents it from working above the ground. However, keep in mind that most pulse induction metal detectors are rather heavy, so they might not be the best option for treasure hunting out of the water.

2.How important is the weight of an underwater metal detector?

The weight matters more with standard metal detectors than with handheld devices. That’s because a metal detector that’s too light will try to emerge on the surface. On the other hand, a detector that’s too heavy will sink as soon as it leaves your hand. But don’t worry, companies have this in mind when making an underwater detector.

3.Can I detect pearls or gemstones with an underwater metal detector?

No, these are non-metal items, so a metal detector won’t recognize them [3]. However, what it can lead you to are the indicator minerals. In this case, a gold metal detector will work better, because it has a higher operating frequency than all-purpose metal detectors.

References

  1. Tyson, J. “How Metal Detectors Work”. How Stuff Works. Retrieved October 17, 2021. https://electronics.howstuffworks.com/gadgets/other-gadgets/metal-detector.htm
  2. Lonic, N. May 11, 2005. “DETECTING MINERALISED & BLACK SAND BEACHES”. Phase Technical. Retrieved October 17, 2021. http://phasetechnical.com.au/detecting-mineralised-black-sand-beaches/
  3. “Can You Hunt for Diamonds & Gemstones with a Metal Detector?” Metal Detector. Retrieved October 17, 2021. https://www.metaldetector.com/learn/buying-guide-articles/gemstones-and-minerals/how-to-hunt-for-diamonds-gemstones

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