3 Best Underwater Metal Detector Reviews

Best Underwater Metal Detector
Buying Guide
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An underwater metal detector is a specialized type of metal detector designed for use in or near water, such as lakes, rivers, and oceans. This type of detector is specifically designed to be waterproof and submersible, allowing treasure hunters to search for valuable items that may have been lost underwater.

With advanced features and capabilities, underwater metal detectors are becoming increasingly popular with hobbyists, treasure hunters, and professional archaeologists. They offer the ability to search for treasures in new and unique environments, providing a whole new world of opportunities for those interested in metal detecting.

Best Underwater Metal Detector Reviews

Underwater metal detectors are specially designed to search for metal objects in aquatic environments such as oceans, lakes, and rivers. Some of the best underwater metal detectors include:

Fisher CZ-21: This metal detector is ideal for searching in saltwater environments and features advanced pulse induction technology.

Garrett Sea Hunter Mark II: This metal detector is designed for deep water treasure hunting and features pulse induction technology for improved depth and sensitivity.

Minelab Excalibur II: This metal detector is highly rated for its superior performance and ability to detect metal targets at great depths.

When choosing an underwater metal detector, it is important to consider the type of environment you will be using it in and your specific metal detection needs. Factors such as the type of water, depth, and the type of metal you are searching for can all impact your decision.

1. Fisher CZ-21 Underwater Metal Detector Review

The Fisher CZ-21 is an underwater metal detector that is designed for use in saltwater environments. It is suitable for both beginner and experienced treasure hunters who want to search for lost items and valuable artifacts in the ocean or other bodies of saltwater.

Fisher CZ-21 Underwater Metal Detector

What's Included?

  • Fisher CZ-21 metal detector
  • Search coil
  • Battery
  • Charger
  • Headphones
  • Instruction manual

Overview of the Features

The Fisher CZ-21 Underwater Metal Detector has several key features:

Multi-Frequency Technology

This metal detector operates on multiple frequencies, allowing the user to search for different types of metal objects with ease.

Lightweight Design

The detector is lightweight and compact, making it easy to carry and maneuver underwater.

Waterproof Design

The CZ-21 is waterproof and submersible, allowing you to use it in various underwater environments.

Adjustable Sensitivity

The sensitivity of the detector can be adjusted to suit the conditions of the underwater environment, making it easier to locate small or deeply buried objects.

Iron Discrimination

The detector has the ability to discriminate between ferrous and non-ferrous metals, which helps you to distinguish between valuable and non-valuable objects.

Target ID

The target ID feature helps to identify the type of metal object you have found, making it easier to determine its value.

Audio and Visual Indicators

The detector has both audio and visual indicators to alert the user of a target, so you won't miss a find even in noisy underwater environments.

Multiple Search Modes

The CZ-21 has multiple search modes, including all-metal, Discriminate, and Pinpoint, allowing you to customize your search for the most effective results.

How to Use It?

  • Assemble the metal detector according to the instructions in the manual.
  • Adjust the sensitivity, discrimination and other settings to match your search area and the type of targets you are looking for.
  • Immersing the search coil into the water and start scanning the area in a slow, sweeping motion.
  • When a target is detected, the metal detector will emit a tone and the LED display will show the target's depth and ID.
  • Use the pinpointing feature to precisely locate the target.
  • Dig up the target and check it to see if it is worth keeping or disposing of.


  • Durable and rugged design for use in harsh underwater conditions
  • Dual-frequency technology for improved target identification
  • Waterproof design for use in saltwater environments
  • Adjustable sensitivity and discrimination settings
  • High-performance search coil for enhanced depth and sensitivity
  • LED display for target identification and depth


  • Requires more experience and skill to use effectively

2. The Garrett Sea Hunter Mark II Review

The Garrett Sea Hunter Mark II is a high-performance underwater metal detector that is specifically designed for use in saltwater and other challenging environments. This metal detector features advanced technology and rugged construction, making it ideal for both professional and recreational treasure hunters.

The Garrett Sea Hunter Mark II

Who is this product for?

This metal detector is best suited for treasure hunters who want to search for lost items in the water, including beaches, lakes, rivers, and other bodies of water. It's ideal for divers and snorkelers who want to explore the underwater world and discover hidden treasures.

What's included?

The Garrett Sea Hunter Mark II metal detector comes with the following items:

  1. Sea Hunter Mark II metal detector
  2. 8" PROformance Submersible Search Coil
  3. 10" x 14" Elliptical Mono Loop Coil
  4. Instructional DVD
  5. Submersible Headphones
  6. Belt Pouch
  7. Warranty card

Overview of the Features

Waterproof Design

The Sea Hunter Mark II is fully waterproof, allowing the user to search in water up to 250 feet deep.

Advanced Target ID System

This metal detector has an advanced target ID system that helps to identify the type of metal being detected and its depth.

Discrimination Mode

The discrimination mode allows the user to eliminate unwanted targets and focus on the type of metal they are looking for.

Adjustable Sensitivity

The sensitivity of the detector can be adjusted to suit the user's needs and conditions.

LED Display

The LED display provides the user with important information such as target ID, depth, and battery life.

How to use it?

Assemble the metal detector: Put together the metal detector according to the instructions provided in the manual.

Set the sensitivity: Turn on the metal detector and adjust the sensitivity to suit the conditions of the search area.

Start searching: Start searching for metal items in the water by moving the searchcoil back and forth.

Identify the target: The LED display will provide information about the target, such as its depth and type of metal.

Digging: If the target is confirmed, dig the item up carefully to avoid damaging it.


  • Durable and waterproof design
  • Lightweight and easy to use
  • Advanced features
  • Good depth range
  • Three piece steam design for diving
  • Faster target response
  • Battery powered


  • Batteries are not included

3. Minelab Excalibur II Metal Detector Review

Minelab Excalibur II is a high-end, underwater metal detector that is designed for treasure hunting in extreme conditions, including deep diving. It is equipped with advanced features, such as multiple frequency detection and automatic ground balance that make it highly effective in detecting all types of metal, including gold and silver, in a variety of environments.

Minelab Excalibur II Underwater Metal Detector

Who Is This Product For?

The Minelab Excalibur II is a waterproof metal detector designed for serious treasure hunters who want to search for treasures in and around water bodies. Whether it's shallow rivers, lakes, or the ocean, the Excalibur II is built to withstand the harsh marine environment and provide accurate and reliable results.

This product is ideal for people who want a high-performance and professional-grade metal detector for underwater treasure hunting.

What‘s Included?

The Minelab Excalibur II metal detector package typically includes:

  1. Metal Detector Unit
  2. Control box
  3. 9-inch or 10-inch search coil
  4. Headphones
  5. Carry bag
  6. Manual
  7. Battery

 Some packages may also include a set of batteries, a charger, and a battery holder.

Overview of the Features

The Minelab Excalibur II is a high-end underwater metal detector that is designed for advanced users and professionals. Some of its key features include:

Waterproof Design

The detector is fully waterproof and can be used in saltwater and freshwater environments to depths of up to 200 feet.

Multiple Frequencies

The Excalibur II is equipped with multiple frequencies that allow it to detect a wide range of metals, including gold, silver, and other precious metals.

Advanced target Identification

The detector features advanced target identification technology that provides the user with detailed information about the type of metal that has been detected.

User-friendly Interface

The Excalibur II has a user-friendly interface that makes it easy to operate and customize the detector settings.

Long Battery Life

The detector is powered by rechargeable batteries and has a long battery life that allows for extended use without the need for frequent recharging.

Rugged Construction

The Excalibur II is built to withstand tough conditions and is made from durable materials that ensure its longevity.

How to Use It?

Using the Minelab Excalibur II underwater metal detector is relatively straightforward. Here are the steps you need to follow:

Assemble the Detector: Before you start using the Minelab Excalibur II, you need to assemble the device. This involves attaching the coil, stem, and control box.

Charge the Battery: Make sure that the battery is fully charged before you start using the detector. You can charge the battery using the included charger.

Adjust Settings: The Excalibur II has various settings that you can adjust to optimize your search. These include sensitivity, ground balance, and discrimination.

Start Searching: Once you have assembled the detector, charged the battery, and adjusted the settings, you can start searching. You can use the detector in the water or on the beach. When you find a target, the detector will give off an audio signal, and the display will show the type of metal.

Pinpointing: Once you have located a target, you can use the detector's pinpointing mode to determine the exact location of the metal object.

Digging: Once you have pinpointed the target, you can use a digging tool to carefully remove the object from the ground.

It is recommended that you familiarize yourself with the Excalibur II's manual and instructions before using the device to ensure optimal performance.


  • Excellent performance in both salt and freshwater.
  • Multiple frequency options allow for versatile search capabilities.
  • Durable, waterproof design can be used in various conditions.
  • Intuitive and user-friendly interface for easy operation.


  • Expensive model

Underwater Metal Detectors Buying Guide

When buying the best underwater metal detector, there are several factors to consider to ensure you purchase the right one for your needs.

Depth Rating

Consider the maximum depth you will be diving or searching in and choose a detector that is rated for that depth.


Some detectors are designed for shallow water searching and have a low frequency, while others are designed for deeper water and have a higher frequency.


The discrimination feature allows you to eliminate unwanted metal objects and only find what you're looking for. Choose a detector with adjustable discrimination for versatility.

Ground Balance

This feature helps to eliminate false signals from mineralization in the water or on the seabed.

Weight and Balance

Make sure the detector you choose is lightweight and balanced for ease of use underwater.

Battery Life

Consider the battery life of the detector, especially if you plan on using it for extended periods of time.


Look for detectors that are waterproof and submersible, ensuring they can be used in all conditions.


Consider the warranty offered by the manufacturer to ensure you're covered in case of any issues with the product.


Determine your budget and choose a detector that fits within your price range while still meeting your needs.

These are some of the key factors to consider when buying an underwater metal detector. By taking the time to research and understand what you need, you can be confident in making the right choice.

Frequently Asked Questions –FAQs

What is an underwater metal detector?

An underwater metal detector is a specialized type of metal detector that is designed to be used in underwater environments, such as in lakes, rivers, or the ocean. These detectors are waterproof and can be submerged in water to locate and identify metal objects.

What are the key features to look for in an underwater metal detector?

Some of the key features to look for in an underwater metal detector include waterproof construction, a high frequency operating range, sensitivity control, and a good target identification system. You may also want to look for a detector with a headphone jack, adjustable arm support, and a good battery life.

Can underwater metal detectors be used on land?

Yes, many underwater metal detectors can be used on land as well, but their performance may be reduced due to the lack of waterproofing.

What is the maximum depth that an underwater metal detector can reach?

The maximum depth that an underwater metal detector can reach will depend on the specific model and its design. Some models may be able to reach depths of up to 200 feet, while others may only be able to reach 30-50 feet.

Can underwater metal detectors detect gold?

Yes, many underwater metal detectors are capable of detecting gold, but their ability to do so will depend on several factors, including the size and location of the gold nugget, the type of soil, and the metal detector's operating frequency and sensitivity.

How do I clean and maintain my underwater metal detector?

To clean and maintain your underwater metal detector, you should rinse it with fresh water after each use, and then allow it to air dry. You should also periodically check the battery connections, and make sure the battery is charged before each use. If you notice any damage or wear, it is best to have the detector repaired by a professional.


Underwater metal detectors are a specialized tool that can help you find hidden treasures in the water. When choosing the best underwater metal detector, it's important to consider the type of detecting you will be doing, the environment you will be detecting in, and your personal preferences.

The Fisher CZ-21 are all great options to consider, each with their own unique features and benefits. By following the tips in the buying guide and familiarizing yourself with the product through the FAQs, you'll be able to make an informed decision and maximize your success while detecting underwater.

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