Mohoo 6'' Inch 150mm Carbon Fiber Composites Vernier Digital Electronic Caliper Ruler Micrometer Minimum scale to read is 0.1mm/0.01'' Battery: SR44/LR44 1.5V or CR2032 3V Measuring range: 0-150mm 0-6'' Resoultion: 0.1mm 0.11' Maximum measuring speed: 1.5m/sec,60''/sec