The Tracker IV is a user-friendly instrument - offering tremendous value for the money - while delivering effective performance over a wide range of conditions and applications. Streamlined in appearance - with only two operating controls and a mode selection switch - the Tracker IV has eliminated the most difficult aspect of metal detector operation: Ground Balancing. With built-in Automatic Ground Trac - the Tracker IV balances for mineralization while you detect. The Tracker IV will detect in extreme ground conditions from salt wet beaches to highly mineralized inland sites with no operator adjustments to the circuitry and with no loss of sensitivity.