Features Fine Design: High-strength carbon fiber composite material, light weight and easy to carry.longer caliper jaws can measuring deeper workpiece and products. High Measurement Accuracy: 0.01”/0.1mm resolution, ±0.01”/0.2mm accuracy. The Digital caliper allows you quick to switch inch and mm with one button and the zero setting allow you start a new measurement at any point. Zero Resetsetting Function : Smart design allows you to reset to zero easily by pressing a button and start a new measurement at any point of the scale, which is very suitable for differential measurement 4 Measuring Modes: This digital caliper can be used to Measure inside and outside diameter, depth and step with two sets of jaws and a probe. Auto On/Off: Auto turns on when sliding, auto turns off after 5mins if with no operation. Specification: Item Type: Electronic Caliper Material: Carbon Size: 150mm/300mm(optional) Function: Measurement Accuracy: 0.1mm Measuring Range: 0-150mm, 0-300mm Operating Temperature: 27-40℃ Battery: 1 X CR2032/LR44 Button Battery (Not Included) Power Button Metric/Imperial Conversion Keys Clear Key Package List: 1 x Electronic Caliper ➤The digital vernier calipers is only for household measurement, such as jewelry, gadgets, woodworking and other household objects. ➤If for industrial measurement, please buy a more professional and more accurate measuring tool in professional field. ➤If you find the readings are not accurate, please slide the LCD screen to the left end (“0” on the scale), and then press the zero button. Welcome to write to us for more questions. Package List 1 x Electronic Caliper