The latest variation of the classic Model 20, but with digital tuning capability. Customers that have purchased the Model 20 digital have noticed the redesigned antenna system increases detection strength. The digital tuning is adjusted by the discrimination knob, also acting as a tuning knob. This gives you the strongest detection toward gold or silver from a distance. It is an excellent piece of equipment for your money! Distance and depth capabilities are a single coin, piece of jewelry, or a small gold nugget as far away as 200 feet and as deep as 24 inches.