10 Best Underwater Metal Detectors 2026 in the United States

The Nokta Makro Invenio is a high-end underwater metal detector designed to find deep treasures and hidden cavities underwater and underground. Its standout feature is the use of Artificial Intelligence, which helps the device deliver precise shape recognition and accurate depth readings, making it easier to identify valuable targets. It offers several search modes to match different skill levels and conditions, including specialized modes for ground anomalies like caves or tunnels.

The detector is well-protected with an IP67 rating, meaning it’s suitable for underwater use and can handle being submerged. The device is aimed at serious treasure hunters looking for deep detection capabilities beyond typical detectors. The Invenio is quite heavy at 40 pounds, which might make it less comfortable for extended use, especially underwater. Its adjustable length helps with ergonomics but doesn't fully offset the weight.

It uses two lithium polymer batteries included with the device. For someone focused on serious underwater treasure hunting who values precision and depth over portability, the Invenio offers advanced tech and solid performance. For casual users or those needing a lighter option, this might feel bulky and demanding.

The Minelab Equinox 900 is a versatile metal detector well suited for underwater treasure hunting and general detecting. Its standout feature is the Multi-IQ technology that simultaneously uses five frequencies, improving sensitivity and target identification across various metals and soil types. This makes it reliable both underwater and on land. The 11" waterproof double-D coils provide a good balance between coverage and target separation, which helps detect objects at reasonable depths. With an IP66 rating, it can handle water exposure well, making it suitable for shallow underwater use, though not for deep diving.

Its discrimination features and 119 target IDs help differentiate valuable finds from junk, which is helpful in trash-heavy areas. The detector offers several modes (Park, Field, Beach, Gold) tailored for different environments, including wet sand and shallow water. Battery life is solid thanks to a built-in rechargeable lithium-ion pack, supporting extended use without frequent recharging. Weighing about 2.8 pounds and featuring a collapsible design with a padded carry bag, it’s comfortable and portable for long detecting sessions. The included waterproof PRO-FIND 40 pinpointer also assists in precisely locating targets underwater or on land.

While the detector is excellent for shallow water and wet environments, it’s not rated for deep diving or prolonged submersion. Priced at a higher point, it might be more suited to serious hobbyists than beginners. The Minelab Equinox 900 is a feature-rich, user-friendly detector that excels in versatility and underwater use up to moderate depths, making it a strong choice for anyone looking to explore both land and shorelines with confidence.

The GreenRex Metal Detector is a solid choice for anyone looking to explore underwater or beach metal detecting, especially adults and families. It offers 5 professional detection modes, including pinpoint accuracy and discrimination options, which help you zero in on the items you want like coins, jewelry, or gold, reducing time spent digging up junk. The 10-inch IP68-rated waterproof coil allows for shallow water use, which is great for beachcombing or river hunting, although the control box itself is not waterproof and should be kept dry during use.

With the upgraded DSP chip and auto-balance technology, it can detect metals up to about 7 inches deep, which is suitable for most hobbyist needs. The detector also has 5 sensitivity levels to adapt to different soil types and conditions, enhancing your chances of finding targets in tricky environments. The large backlit LCD screen and LED lighting make it user-friendly even in low light, and the ergonomic design with a silicone-coated handle and adjustable armrest helps with comfort during longer hunts.

Portability is a plus here: the telescoping rod extends up to 132 cm for adults and collapses down to 62 cm for easy transport. The unit weighs around 5 pounds, which is moderately heavy but manageable for most users. It runs on two 9V batteries, included with the purchase, so you won’t need extra gear right away. Included accessories like premium headphones, a foldable shovel, and a carrying bag add convenience and make this a ready-to-go package for beginners and seasoned users alike. This detector offers versatile features for underwater and beach metal detecting, though users should be mindful of the control box's water sensitivity and consider its weight for extended sessions.