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Fisher CZ-21

   (1 review)

Steve Herschbach
  • Price: $1099 Freq: Multi Weight: 5.3 lbs Waterproof?: Yes Current?: Yes

The Fisher CZ-21 metal detector was introduced in 2009 and is still in production. The CZ-21 replaces the earlier CZ-20 model and is essentially the same unit with slight modifications. The Fisher CZ-21 is a fully submersible multifrequency VLF metal detector aimed primarily at underwater use. The 250 foot maximum depth makes the CZ-21 suitable for use while SCUBA diving. Note that as a diving detector both the headphones and coil are hardwired into the control box and cannot be changed. There is a choice of 8" or 10.5" concentric coils at the time of purchase.

"The CZ-21 and 1280X are housed in the most rugged enclosures and each have the same collapsible pole assemblies. A short pole assembly is desired when diving, but full extension is preferred when standing or wading. Both are submersible to 250 feet. The control housing can be easily removed for hip-mounting or it can be chest-mounted with an optional chest harness. The CZ-21 has a reputation for being the best saltwater metal detector ever made, while the 1280X is known for being the best fresh water detector, but both can be used in either environment. The CZ-21 is a multi-frequency metal detector that has adjustable discrimination, is easy to use and designed to handle the toughest mineral concentrations on any salt or fresh water beach. The CZ-21 also has Audio Tone Target-ID, a highly sought after feature that allows users to distinguish iron targets from gold. The CZ-21 delivers!" Source: Fisher 2016 catalog

Fisher CZ-21 metal detector

Fisher CZ-21 control panel

  • Dual Frequency Fourier Domain Signal Analysis
  • 5 kHz and 15 kHz Operating Frequencies
  • One touch Pinpoint (V.C.O. non-motion)
  • Manual Ground Balance
  • All Metal Auto-Tune Mode
  • 2 Year Warranty
  • Discrimination Mode with 3-tone Audio Target-ID
  • Large Target Alert Audio, Faint Target Audio Boost
  • Adjustable Sensitivity, Discrimination and Volume
  • Battery Test Mode
  • Fully Collapsible Pole Assembly
  • Submersible to 250 feet (76 m)
  • Removable control housing
  • Uses four 9V Alkaline batteries
  • Available with 8" (20 cm) or 10" (25 cm) Concentric Round Open Searchcoil 
  • Weight: 5.3 lbs. (2.4 kg) w/8" (20 cm) Searchcoil, 5.9 lbs. ( 2.7 kg) w/10" (25 cm) Searchcoil

Official Fisher CZ-21 Product Page

Fisher CZ-21 Owner's Manual

First Texas (Fisher) Metal Detector Forum


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Steve Herschbach

   4 of 4 members found this review helpful 4 / 4 members

I used both the earlier CZ-20 and the CZ-21. I am a fan of the CZ series in general, and consider the CZ-21 to be one of the two VLF detectors I personally favor for serious water detecting, the other being the Minelab Excalibur. I am purposefully excluding detectors waterproof to 10 feet when I say this. The CZ-21 at 250 ft and Excalibur at 200 ft depth capability are far more robust detectors for those that truly intend on using a detector almost exclusively in the water. Detectors good to 10 feet are ok for mask and snorkel use but the CZ-21 is a true SCUBA capable detector.

The downside is that means it is built like a tank with the weight that goes along with that. Unless you actually need that 250 ft depth rating there are far lighter and less expensive options available now. One small thing tipped me from the CZ-20/21 to the Excalibur and that is the way its audio discrimination was designed for coins instead of jewelry, and audibly puts nickel range targets into the high tone coin category. As a detector designed more for jewelry use the CZ-21 should read nickel range targets as mid-tone. That it does not means that to use the discrimination you either have to accept on passing on nickel range targets if you dig only the mid-tone targets, or just default to a simple ferrous/non-ferrous setting. This flaw largely negates the benefit of even having a mid-tone audio response. The Excalibur dies not suffer from this flaw. That is unfortunate as I rather prefer the CZ-21 otherwise as having a standard control panel with knob arrangement that can be easily hip or chest mounted out of box without extra accessories. The battery setup is more straightforward than that on the Excalibur. The tone arrangement is also simpler and more understandable than the more complex audio produced by the Excalibur, again excepting the aforementioned flaw. Finally, the CZ-21 offers a true all metal ground balance mode which I like a lot. All in all a great detector but I wish Fisher would have updated the machine to put the nickel range back at mid-tone, which would make it a far easier choice for me as compared to the Excalibur. It's really that one thing that puts my off the CZ; other than that it is a near perfect VLF machine for use to SCUBA depths. Hip-mounted it actually is also a very effective coin detector .

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