Fisher CZ-21 – Professional Submersible Metal Detector

The Fisher CZ-21 is a fully submersible, dual-frequency metal detector designed for professionals who require absolute reliability beneath the surface. Engineered for underwater exploration, saltwater environments, and demanding shoreline conditions, the CZ-21 offers a distinguished blend of depth, stability, and elegant simplicity.

With its proven dual-frequency design, rugged marine-grade construction, and refined audio clarity, the CZ-21 remains one of the most trusted underwater detectors available today.

Engineered for the Water — Built to Endure

Purpose-built for real ocean conditions, the CZ-21 is rated fully submersible to 250 feet, allowing effortless transition between:

• Saltwater surf and wet sand

• Shallow diving

• Deep underwater hunting

• Freshwater lakes and rivers

• Rocky shorelines and tidal zones

Every detail — from its sealed control pods to its corrosion-resistant hardware — is crafted for long-term durability in environments where only the highest quality equipment will last.

Dual Frequency Intelligence for Salt & Fresh Water

The CZ-21 operates on simultaneous dual frequencies (5 kHz and 15 kHz), allowing it to maintain remarkable stability in saltwater while still offering excellent sensitivity to both small jewelry and deeper, heavier targets.

This balanced performance ensures:

• Strong response to gold rings and fine jewelry

• Impressive depth on coins and high-conductivity metals

• Smooth, controlled operation in mineralized wet sand

• Accurate target separation in underwater conditions

The result is a detector that feels composed, predictable, and highly capable — even in challenging saltwater environments where single-frequency detectors often falter.

Refined Target Audio With Tone ID

The CZ-21 uses Fisher’s renowned 3-tone audio identification, delivering unmistakable target tones that remain clear underwater or through headphones:

• High tone for coins and jewelry

• Mid tone for pull-tabs and gold items

• Low tone for iron

Its audio is deliberately simple, elegant, and precise — a design choice made for underwater environments where visual displays are impractical.

Rugged 10” Search Coil for Precision in the Water

This model features the 10-inch waterproof coil, chosen for its:

• Superior maneuverability in currents

• Refined precision in rocky and cluttered bottoms

• Excellent sensitivity to small gold items

• Stable operation near iron deposits or underwater debris

The 8” configuration is ideal for divers, surf hunters, and professionals working areas where control and handling are crucial.

User-Focused Simplicity, Professional-Level Capability

Despite its advanced internal engineering, the CZ-21 maintains a clear, intuitive control layout designed for rapid adjustments underwater. Its large knobs, sealed interface, and ergonomic balance make it comfortable for extended hunts, whether wading or diving.

Why Professionals Choose the Fisher CZ-21

Discerning water detectorists select the CZ-21 for its:

• Proven performance in harsh saltwater

• True submersible rating to 250 ft

• Dual-frequency stability

• Clear and accurate tone ID

• Rugged construction for long-term use

• Professional-level depth and sensitivity

• Confidence in Fisher’s decades of underwater detector expertise

For those who hunt beneath the waves, the CZ-21 is a benchmark of reliability and capability.

What’s Included

• Fisher CZ-21 metal detector

• 10" fully submersible search coil

• Waterproof control housing

• Submersible headphones

• Shaft & mounting hardware

• User manual

• Batteries

Technical Overview

• Technology: Dual-frequency (5 kHz & 15 kHz)

• Operating Depth: Fully submersible to 250 ft

• Search Coil: 10" waterproof coil

• Audio: 3-tone target ID

• Mode: Silent-search discriminate & pinpoint

• Ground Balance: Manual

• Power: 4 × 9V batteries

• Weight: Approx. 6.7 lb (varies with configuration)

• Warranty: 2-Year Limited Warranty