PRECISION MILLI GAUSS METER Model : GU-3001 * Measurement : mG ( milli Gauss) , uT ( micro Tesla) * Range : - 3, 000 mG to 3, 000 mG, DC/ AC - 300.0 uT to 300.0 uT, DC/ AC * Resolution : 1 mG/ 0.1 uT. * Sensor : High sensitivity gauss sensor. * Data hold. Record ( Max, Min) , RS232/ USB. * 1.5 V battery ( UM-4/ AAA ) x 6 PCs or DC 9V adapter.