Best for

Based on this detector's specs and real field testing.

Built for Gold & Beach huntingSuited to Advanced users

Great for

  • Gold
  • Beach
  • Advanced

Not ideal for

  • Coin
  • Relic
  • Beginner
  • Intermediate
Specifications Shipping

Fisher CZ-21 Quicksilver Scuba Metal Detector

Deep Water Detection with Proven Dual-Frequency Performance

The Fisher CZ-21 Quicksilver Scuba Metal Detector is built for serious detectorists who need reliable performance in deep water and extreme conditions. Designed for full submersion, it operates smoothly in both freshwater and saltwater, making it a dependable choice for underwater treasure hunting.

With dual-frequency technology, it delivers strong depth, accurate target response, and stable performance, even in mineralized environments where many detectors struggle.


Key Features

  • Dual-Frequency Technology
    Provides consistent detection and accurate target response across different conditions.
  • Waterproof up to 250 Feet
    Built for scuba diving and deep-water detecting.
  • Strong Depth Performance
    Detects deeper targets with reliable signal clarity.
  • Accurate Target Identification
    Helps distinguish valuable targets from unwanted metals.
  • Compact Coil for Control
    Offers better maneuverability and precision in underwater environments.

Why It Matters

Underwater detecting requires equipment that can handle pressure, mineralization, and limited visibility. A fully submersible detector with stable performance ensures you can focus on targets with confidence, even in challenging underwater conditions.


Best For

  • Scuba diving and deep-water detecting
  • Saltwater and freshwater environments
  • Underwater treasure hunting
  • Detectorists needing a rugged, waterproof solution

Shipping

Free Shipping on all orders over $99.

Standard shipping: 3-7 business days.

Express shipping: 1-3 business days.

Returns: 30-day hassle-free returns. Items must be unused and in original packaging.

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What Our Customers Say

Real reviews from real treasure hunters who trust Detector Hero for their gear.

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VERIFIED REVIEWS
5.0

Based on 4 verified reviews

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for Fisher CZ-21 Quicksilver Scuba Metal Detector, Dual-Frequency | Waterproof up to 250ft

Reviews are verified against orders before publishing.

  • 5 stars: 4 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
E
Emily White
Solid Investment for Surf Detecting

Spent a full weekend detecting in knee-deep surf and deeper pools. Never had a false signal issue and the battery life was impressive. Solid investment.

J
John Price
Zero Issues at 60 Feet

Tested the waterproof claims at 60 feet and zero issues. The housing is robust, the controls are glove-friendly, and the detection range is impressive even at depth.

S
Sharon Coleman
Serious Tool for Serious Divers

If you're serious about underwater detecting, this is the one. The depth rating gives you confidence, and the dual-frequency picks up targets that my old single-freq unit missed entirely.

H
Hannah Jackson
Flawless at 40 Feet

Took this down to 40 feet during a wreck dive and it performed flawlessly. The waterproofing is no joke—no leaks, no fogging, just solid detection the whole time.