Prospectors who've used shaft-mounted detectors all day know the arm burn

It transmits 5 kHz and 15 kHz at the same time and reads both through Fourier Domain processing

Ultra lightweight sand scoop weighs about a pound on a postal scale

burr-free finish

Fisher CZ-21 Dual Frequency Metal Detector for Underwater Hunting alligator clips Prospectors who've used shaft-mounted detectorsThe Fisher CZ 21, known to divers as the CZ21 QuickSilver, is a dual frequency underwater metal detector submersible to 250 feet, built for scuba divers and surf hunters who work saltwater beaches, freshwater lakes, and deep dive sites. Where single frequency VLF detectors chatter in hot black sand, wet salt, and mineralized mud, the CZ 21's Fourier Domain signal processing keeps targets clear. It ships with an 8 inch concentric waterproof coil,