Ground balance all the way to salt Static All Metal Pinpoint with Depth Indicator 19 kHz Operating Frequency Backlit Display (Backlight) Computerized GROUND GRAB, One Touch Ground Balance with Manual Override This Fisher high performance coin and relic metal detector comes standard with the 10'' x 5'' DD search coil. It operates at 19 kHz. If you are serious about relic hunting, you will quickly discover that the Fisher F-19 is one of the best relic hunting detectors ever!