Dual operating frequency makes the CZ-21 able to

operate is fresh or salt water environments

* Fisher CZ-21 Metal Detector features:
* Multi-use, Hunt Anywhere: On the beach or in mineralized soil, automatically.
* Backed by a 2 Year Guarantee: 2 year limited warranty.
* Dual Frequency: 5 & 15 kHz High Performance,
* Submersible,
* Tone ID Metal Detector for underwater, surf, beach, anywhere in all kinds of weather
* New Improved pinpointer control
* Improved water proofing to 250 feet
* Comes with 8" Search coil
* Two Year Warranty