Ultrasonic thickness gaugeMeasuring range(metric/imperial): 1.5-200mm,0.06-8inchMaterials measured: same as 8812Sound velocity: 500-9000m/sLower limit steel pipes:Φ 15*2.0mm, Φ20*3.0mmdetermined by the transducerResolution: 0.1mmAccuracy: +(0.5%n+0.1)Power supply: 4*1.5V AA(UM-3)batteryDimensions: 160*68*32mm19KGS18KGS20PCS