Can Metal Detectors Be Used In Water?
Are you interested in finding lost treasure under the water, just like in the movies? If so, you’ll need a reliable way to detect whether an area holds rings, coins, or other metal worth exploring further. You’ve almost certainly heard of metal detectors, but you may never have stopped to ask whether a metal detector can actually be used underwater. The short answer is yes – and once you understand how an underwater metal detector works, where you can use it, how deep it can go, and which model fits your kind of hunting, you’ll be ready to start searching lakes, rivers, surf, and saltwater beaches with confidence.
Yes – Metal Detectors CAN Be Used In Water!
While it may be a surprise, many metal detectors can be used underwater. Most standard, land-based metal detectors aren’t completely waterproof, but a true submersible metal detector is built to work very well beneath the surface. Before purchasing a waterproof metal detector, it’s important to fully understand where and how you plan to use your new treasure hunting device – wading the shallows, hunting the wet sand and surf, or fully diving – because that decision determines which type of detector is right for you.
Waterproof vs. Submersible: Know the Difference Before You Buy
One of the most common and costly mistakes new hunters make is assuming every “waterproof” metal detector can be fully submerged. It can’t. There are really three levels of water resistance to understand:
Rain-resistant (splash-proof): The control box can handle a little rain or spray, but it should never be dunked. These are land detectors, not water detectors.
Waterproof coil and shaft only: You can dip the search coil and lower shaft into shallow water, but the control box and headphones must stay dry. These are great for wading the edge of a lake or stream, not for diving.
Fully submersible: The entire detector – coil, shaft, control box, and headphones – is sealed and rated to a specific depth. This is the only type of underwater metal detector you should take fully beneath the surface.
When a listing simply says “waterproof,” always check exactly which parts are protected and the maximum rated depth before you buy.
How Are Submersible Metal Detectors Different?
Waterproof metal detectors are built much differently than traditional models. They are engineered to protect every component – including the control box and any headphones – from water intrusion, with sealed housings and waterproof connectors. The interface also varies by manufacturer. Instead of the large digital displays you see on land-based detectors, underwater detectors often rely on LED lights and vibration to signal to the user that metal has been found, since a screen can be hard to read through a diving mask or murky water. Many models also use waterproof or bone-conduction headphones so you can still hear target tones while submerged.
Saltwater vs. Freshwater: Why the Technology Matters
Not every underwater metal detector performs the same in every body of water, and the reason comes down to the detection technology inside. Saltwater and wet, mineralized sand are highly conductive, which causes many standard detectors to chatter with false signals or lose depth. There are two main technologies to know:
VLF (Very Low Frequency): Excellent at telling different metals apart (target ID), making it ideal for freshwater lakes, rivers, and ponds. VLF detectors with a dedicated saltwater or beach mode can also work on the coast, but they can struggle in heavy surf.
Pulse Induction (PI): Far less affected by salt and mineralization, which makes PI the go-to choice for ocean beaches, surf, and deep saltwater diving. The trade-off is less precise target discrimination, so you’ll dig more trash along with the treasure. A handful of advanced detectors use multi-frequency or BBS technology to deliver strong saltwater performance with better discrimination than traditional PI.
If you mainly hunt freshwater, a quality VLF detector is usually all you need. If you’re chasing rings and coins in the surf or planning to dive saltwater, lean toward a pulse induction, multi-frequency, or saltwater-optimized model.
How to Choose: Match the Detector to Your Hunt
The fastest way to narrow your choice is to start with where you’ll hunt and how deep you need to go, then work back to the technology and depth rating. Use the quick-reference table below as a starting point.
| Where You’ll Hunt | Detector Type | Typical Depth Rating | Best Technology |
|---|---|---|---|
| Wet sand & shallow wading (freshwater or beach) | Waterproof coil/shaft or fully waterproof land detector | Up to ~10 ft (3 m) | VLF or multi-frequency |
| Lakes, rivers & ponds (freshwater) | Submersible VLF detector | ~10–16 ft (3–5 m) | VLF / multi-frequency |
| Surf & saltwater beaches | Saltwater-optimized detector | ~10–16 ft (3–5 m) | Pulse Induction, BBS, or multi-frequency |
| Scuba & deep saltwater diving | Fully submersible dive detector | Up to 200–250 ft (60–75 m) | Pulse Induction or BBS |
Popular Waterproof and Submersible Models
To make this practical, here are well-known detectors that cover each kind of water hunting, from shallow wading to deep diving. Serious Detecting carries leading waterproof and submersible brands, and our team can match any of these to your budget and conditions.
Garrett AT Pro & AT Max (waterproof to ~10 ft): Versatile VLF detectors great for freshwater, wet sand, and shallow wading – a strong, affordable starting point.
Nokta Simplex Ultra (waterproof to ~16 ft): Beginner-friendly, fully submersible all-rounders for freshwater and beach hunting at an entry-level price.
Minelab Equinox 700/900 (waterproof to ~10 ft): Multi-frequency detectors that switch easily between freshwater, beach, and saltwater modes – a favorite for versatility.
Fisher CZ-21 (submersible to ~250 ft): A dual-frequency classic that performs in both salt and freshwater, suited to serious divers.
Minelab Excalibur II (submersible to 200 ft): BBS technology built for saltwater, beloved by beach and dive hunters chasing gold and silver.
Nokta Legend 2 (waterproof to 16 ft / 5 m, IP68): A simultaneous multi-frequency powerhouse with dedicated Beach mode, making it one of the best-value all-rounders for saltwater surf, freshwater, and dry land alike.
Always confirm the current depth rating and included accessories on the product page, and respect the manufacturer’s maximum depth to avoid flooding the unit.
Not All Waterproof Metal Detectors Are Created Equal
When shopping for a waterproof metal detector, one of the first things to consider is how much depth you’ll actually need. More affordable submersible models are typically rated for somewhere between 10 and 16 feet, while higher-end models are built for far greater depths suitable for serious scuba diving. It’s also critical to confirm that a submersible detector is completely waterproof. As noted above, some detectors are marketed as “waterproof” when that really only refers to the search coil and shaft – not the control box or headphones. When you’re looking for a fully submersible metal detector, make sure the entire package is rated to be submerged, and always respect the manufacturer’s maximum depth rating to avoid flooding the unit.
What Can You Find With an Underwater Metal Detector?
Water hunting is one of the most rewarding forms of the hobby because the water constantly delivers fresh targets and keeps them concentrated in predictable spots. Swimmers lose jewelry where cold water shrinks their fingers, and waves sort heavier items like gold and coins into “troughs” in the sand. Common finds include gold and silver rings, earrings and pendants, modern and old coins, watches, phones and keys, and the occasional genuine relic or historic artifact in older swimming and boating areas. Saltwater beaches, popular swimming lakes, boat launches, and old docks are all prime hunting grounds.
Tips for Getting Started With Water and Beach Detecting
A few simple habits will make your first water hunts far more productive. Start in shallow, calm water while you learn how your detector responds before moving into the surf. Use a long-handled sand scoop so you can recover targets without constantly bending into the water. Hunt the wet sand and the trough just past the dry beach, where heavier valuables tend to settle. Always rinse your detector with fresh water after saltwater use to prevent corrosion, and check the seals and battery compartment regularly. Finally, know the local rules – many beaches and parks allow detecting, but some require permits or restrict certain areas.
For the full saltwater-and-surf detector lineup, see our best beach metal detectors guide or our complete collection of waterproof detectors.
Frequently Asked Questions About Underwater Metal Detectors
Can any metal detector be used in water?
No. Only detectors that are specifically rated as waterproof or fully submersible should be used in water. A standard land detector may survive light rain, but submerging its control box will likely ruin it.
How deep can an underwater metal detector go?
It depends on the model. Entry-level submersible detectors are usually rated for about 10 to 16 feet, while premium diving models like the Minelab Excalibur II and Garrett Sea Hunter Mark II can handle up to 200 feet or more. Always stay within the manufacturer’s stated depth rating.
What is the best metal detector for saltwater beaches?
For surf and saltwater, a pulse induction (PI), BBS, or multi-frequency detector performs best because it ignores the false signals caused by salt and mineralized sand. Popular choices include the Minelab Excalibur II, Minelab Equinox, and Garrett Sea Hunter Mark II.
What’s the difference between a waterproof and a submersible metal detector?
“Waterproof” often refers only to the coil and shaft, meaning you can wade but not dive. “Fully submersible” means the entire detector – including the control box and headphones – is sealed and rated for use underwater.
Can you use a waterproof metal detector on land too?
Yes. Most waterproof and submersible detectors work perfectly well on dry land, which makes them a versatile choice if you split your time between the beach, the water, and inland sites.
Reach Out to Serious Detecting for More Information About Waterproof Metal Detectors
Whether you’re looking for an inexpensive waterproof metal detector or a fully submersible model for serious diving, feel free to reach out to the experts at Serious Detecting today. We have specialists on standby who are ready to answer any questions you may have about choosing the right metal detector for your needs, your budget, and the kind of water you plan to hunt. Give us a call toll free at (844) 771-0707, or send us an email using the online contact form on our website.
