Fisher CZ-21 Waterproof Metal Detector

The Fisher CZ-21 is great for water and beach hunters who demand accuracy, depth, and durability. Fully waterproof up to 250 feet, this proven detector performs flawlessly in both salt and freshwater environments. Using Fisher’s dual-frequency VLF technology, the CZ-21 delivers stable operation, deep detection, and reliable target ID—whether you’re diving, wading, or working the wet sand.

Simple analog controls make setup quick and intuitive, while tone ID and adjustable discrimination let you focus on valuable targets. Available with 8″ or 10.5″ search coils, the CZ-21 offers precision for tight areas or maximum coverage for deeper finds. Rugged, balanced, and built to last, it’s the ultimate all-weather detector for underwater and shoreline treasure hunting.
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Customer Questions & Expert Answers about the Fisher CZ-21 Waterproof Metal Detector

Get real answers from outdoor explorers and our product experts. Browse questions about performance, features, and setup —or ask your own to make sure this gear fits your next adventure.

Fisher CZ-21 — Ultimate Depth, Built for the Water

The Fisher CZ-21 is a legendary underwater metal detector trusted by beach hunters, divers, and treasure seekers who need rock-solid performance in the toughest environments. With dual-frequency VLF technology, simple controls, and extreme waterproofing, the CZ-21 delivers powerful target detection in saltwater, freshwater, and mineralized sand — all without complicated setup.

Why Detectorists Choose It

  • Dual-frequency performance: Hunt deeper and more accurately in both salt and fresh water with 5 kHz + 15 kHz simultaneous VLF operation.
  • Turn-on-and-go reliability: Simple knobs for sensitivity, volume, threshold, discrimination, and ground balance keep operation smooth and intuitive — even with gloves on.
  • Smarter underwater digging: Three-tone audio target ID lets you distinguish low, medium, and high conductivity targets quickly, even when visibility is zero.
  • Dive-ready build: Fully submersible to 250 ft with sealed electronics and a rugged waterproof coil, perfect for surf hunting, snorkeling, or scuba detecting.

Key Features

  • Dual-frequency VLF (5 kHz + 15 kHz) detection
  • Three-tone audio target identification
  • Fully submersible to 250 ft / 76 m
  • Manual ground balance for precision in changing conditions
  • Waterproof 8” or 10.5” search coil
  • Rugged, sealed control housing
  • Easy-to-use analog controls
  • Runs on 4×9V batteries for long runtime

Popular Upgrades

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Not sure which coil size or accessory combination fits your hunting environment? Our experts can help you build the perfect Fisher CZ-21 package for diving, surf hunting, or freshwater jewelry recovery. Contact us anytime for free guidance.

Why Detectorists Choose Us

  • Authorized dealer, genuine warranties, and honest advice.
  • Fast U.S. shipping from Michigan; local pickup available.
  • Exclusive bundle deals and seasonal promotions.

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