Ground BalanceGround balance is the function of reducing the environment interference on metal detectors.MOTION metal detector has auto or pre-set ground balance due to its electric circuit. NON-MOTION metal detector such as MD6001 and MD6005 is sensitive to the surroundings. Balance button need be pressed often to guarantee the normal detection.For metal detectors with both MOTION and NON-MOTION, auto ground balance is only effective under MOTION mode.