The Story
Fisher CZ-21 Underwater Metal Detector with 8" Coil
The Fisher CZ-21 with 8" coil is a professional-grade underwater metal detector built for serious treasure hunters searching land, beaches, surf, freshwater, saltwater, and deep diving environments. With dual-frequency VLF operation at 5 kHz and 15 kHz, 3-tone audio Target-ID, manual ground balance, Auto-Tune all-metal searching, V.C.O. pinpointing, and waterproof construction rated to 250 feet, the CZ-21 is made for demanding wet and mineralized conditions.
What’s Included
Dual-Frequency VLF Performance
The CZ-21 uses simultaneous 5 kHz and 15 kHz operation for advanced target analysis in saltwater, freshwater, wet sand, mineralized ground, and land hunting conditions. This dual-frequency design helps the detector remain stable while still responding strongly to coins, jewelry, and relics.
Built for Underwater Use
Designed to withstand depths up to 250 feet, the CZ-21 is built for divers, beachcombers, surf hunters, and shoreline detectorists who need serious waterproof performance instead of simple splash resistance.
8" Coil Control
This CZ-21 version includes the 8" waterproof searchcoil. The 8" coil is a strong choice for divers and beach hunters who want improved maneuverability around rocks, docks, debris, tight shoreline areas, and underwater targets.
Auto-Tune and V.C.O. Pinpoint
Auto-Tune all-metal searching helps maximize response in difficult conditions, while V.C.O. no-motion pinpointing gives precise target location for cleaner recovery in sand, water, and soil.
Key Features
Fully Submersible
Waterproof construction designed for underwater operation up to 250 feet.
8" Waterproof Coil
Includes the 8" waterproof searchcoil for better control in water and tighter search areas.
Dual Frequency
Simultaneous 5 kHz and 15 kHz VLF operation for advanced target analysis.
3 Operating Modes
Target-ID, Auto-Tune, and Pinpoint modes give flexibility for different search conditions.
Manual Ground Balance
Manual ground balance helps adapt the detector to salt, mineralization, and changing conditions.
3-Tone Audio
Low, medium, and high audio tones help classify targets by sound.
V.C.O. Pinpoint
Push-button V.C.O. no-motion pinpointing helps locate targets accurately.
Waterproof Headphones
Includes permanently attached waterproof headphones for submerged use.
Long Battery Life
Powered by four 9V batteries with up to 55 hours of operation.
General Features
- Purpose: deep diving, relic hunting, coin shooting, beach hunting, and jewelry hunting.
- Fully submersible waterproof design up to 250 feet.
- 8" waterproof searchcoil.
- Dual-frequency VLF operation at 5 kHz and 15 kHz.
- 3 operating modes: Target-ID, Auto-Tune, and Pinpoint.
- Manual ground balance.
- Silent-search discrimination mode.
- All-metal Auto-Tune searching.
- V.C.O. no-motion pinpointing.
- 3-tone audio Target-ID: low, medium, and high.
- Audio boost for faint targets.
- Saltwater and freshwater operation.
- Analog control layout.
- Permanently attached waterproof headphones.
- Hip-mountable control box.
Why Choose the CZ-21 with 8" Coil?
The Fisher CZ-21 with 8" coil is a strong choice for detectorists who want a serious waterproof detector with better coil control in tight areas. The 8" coil is especially useful around rocks, dock areas, underwater obstacles, shoreline structure, and spots where precise target recovery matters.
Fisher CZ-21 8" Coil Specifications
| Product | Fisher CZ-21 Underwater Metal Detector with 8" Coil |
|---|---|
| Manufacturer | First Texas Products, LLC |
| Brand Name | Fisher Research Labs |
| Country of Origin | USA |
| Warranty | 2 Years |
| Technology | VLF |
| Frequency | Dual Frequency: 5 kHz and 15 kHz |
| Operating Modes | 3: Target-ID, Auto-Tune, Pinpoint |
| Ground Balance | Manual |
| Discrimination | Yes, silent-search discrimination |
| Target ID | 3-tone audio Target-ID |
| Numeric ID | No |
| Fe Readout | No |
| Fe-Tone Audio | No |
| Audio | 3-tone audio feedback: low, medium, high |
| Volume | 10-level adjustment |
| Sensitivity | 10-level adjustment |
| Depth Indicator | No |
| Pinpoint | Yes, V.C.O. no-motion pinpointing |
| Memory | No |
| Backlight | No |
| Display | Analog |
| Weatherproof | Fully submersible to 250 feet |
| IP Rating | IP54 listed in provided product data; detector is marketed as fully submersible to 250 feet |
| Stock Searchcoil | 8" waterproof searchcoil |
| Headphones | Permanently attached waterproof headphones |
| Weight | 5 lbs. 11 oz. / 2.6 kg |
| Battery Type | 4 x 9V batteries, not included |
| Battery Life | Up to 55 hours, alkaline recommended |
Description
Fisher CZ-21 Underwater Metal Detector with 8" Coil
The Fisher CZ-21 with 8" coil is a professional-grade underwater metal detector built for serious treasure hunters searching land, beaches, surf, freshwater, saltwater, and deep diving environments. With dual-frequency VLF operation at 5 kHz and 15 kHz, 3-tone audio Target-ID, manual ground balance, Auto-Tune all-metal searching, V.C.O. pinpointing, and waterproof construction rated to 250 feet, the CZ-21 is made for demanding wet and mineralized conditions.
What’s Included
Dual-Frequency VLF Performance
The CZ-21 uses simultaneous 5 kHz and 15 kHz operation for advanced target analysis in saltwater, freshwater, wet sand, mineralized ground, and land hunting conditions. This dual-frequency design helps the detector remain stable while still responding strongly to coins, jewelry, and relics.
Built for Underwater Use
Designed to withstand depths up to 250 feet, the CZ-21 is built for divers, beachcombers, surf hunters, and shoreline detectorists who need serious waterproof performance instead of simple splash resistance.
8" Coil Control
This CZ-21 version includes the 8" waterproof searchcoil. The 8" coil is a strong choice for divers and beach hunters who want improved maneuverability around rocks, docks, debris, tight shoreline areas, and underwater targets.
Auto-Tune and V.C.O. Pinpoint
Auto-Tune all-metal searching helps maximize response in difficult conditions, while V.C.O. no-motion pinpointing gives precise target location for cleaner recovery in sand, water, and soil.
Key Features
Fully Submersible
Waterproof construction designed for underwater operation up to 250 feet.
8" Waterproof Coil
Includes the 8" waterproof searchcoil for better control in water and tighter search areas.
Dual Frequency
Simultaneous 5 kHz and 15 kHz VLF operation for advanced target analysis.
3 Operating Modes
Target-ID, Auto-Tune, and Pinpoint modes give flexibility for different search conditions.
Manual Ground Balance
Manual ground balance helps adapt the detector to salt, mineralization, and changing conditions.
3-Tone Audio
Low, medium, and high audio tones help classify targets by sound.
V.C.O. Pinpoint
Push-button V.C.O. no-motion pinpointing helps locate targets accurately.
Waterproof Headphones
Includes permanently attached waterproof headphones for submerged use.
Long Battery Life
Powered by four 9V batteries with up to 55 hours of operation.
General Features
- Purpose: deep diving, relic hunting, coin shooting, beach hunting, and jewelry hunting.
- Fully submersible waterproof design up to 250 feet.
- 8" waterproof searchcoil.
- Dual-frequency VLF operation at 5 kHz and 15 kHz.
- 3 operating modes: Target-ID, Auto-Tune, and Pinpoint.
- Manual ground balance.
- Silent-search discrimination mode.
- All-metal Auto-Tune searching.
- V.C.O. no-motion pinpointing.
- 3-tone audio Target-ID: low, medium, and high.
- Audio boost for faint targets.
- Saltwater and freshwater operation.
- Analog control layout.
- Permanently attached waterproof headphones.
- Hip-mountable control box.
Why Choose the CZ-21 with 8" Coil?
The Fisher CZ-21 with 8" coil is a strong choice for detectorists who want a serious waterproof detector with better coil control in tight areas. The 8" coil is especially useful around rocks, dock areas, underwater obstacles, shoreline structure, and spots where precise target recovery matters.
Fisher CZ-21 8" Coil Specifications
| Product | Fisher CZ-21 Underwater Metal Detector with 8" Coil |
|---|---|
| Manufacturer | First Texas Products, LLC |
| Brand Name | Fisher Research Labs |
| Country of Origin | USA |
| Warranty | 2 Years |
| Technology | VLF |
| Frequency | Dual Frequency: 5 kHz and 15 kHz |
| Operating Modes | 3: Target-ID, Auto-Tune, Pinpoint |
| Ground Balance | Manual |
| Discrimination | Yes, silent-search discrimination |
| Target ID | 3-tone audio Target-ID |
| Numeric ID | No |
| Fe Readout | No |
| Fe-Tone Audio | No |
| Audio | 3-tone audio feedback: low, medium, high |
| Volume | 10-level adjustment |
| Sensitivity | 10-level adjustment |
| Depth Indicator | No |
| Pinpoint | Yes, V.C.O. no-motion pinpointing |
| Memory | No |
| Backlight | No |
| Display | Analog |
| Weatherproof | Fully submersible to 250 feet |
| IP Rating | IP54 listed in provided product data; detector is marketed as fully submersible to 250 feet |
| Stock Searchcoil | 8" waterproof searchcoil |
| Headphones | Permanently attached waterproof headphones |
| Weight | 5 lbs. 11 oz. / 2.6 kg |
| Battery Type | 4 x 9V batteries, not included |
| Battery Life | Up to 55 hours, alkaline recommended |
