Specifications:Size: 7x4x2cm/2.76*1.57*0.79"Weight: 50gColor: grayMeasuring range: 0.00mm~1.99mm 0mil~80milMeasurement accuracy: 2% rdg 0.1mm, or 2% rdg 4milCalibration piece: 0.1mm ,0.25mm, 0.5mm ,1mm, 2mmBattery: 3V button battery (Not included) Features:It can measure iron and aluminum, improve accuracy, expand the scope of measurement, have higher resolution and better cost effectiveness.