[4 Measurement method and safety]: Digital caliper can be used to measure inner diameter and outer diameter, depth and step. The pin of the caliper is made of plastic, so there is no short circuit when measuring the battery or inside. Contact positive and negative. The safety is higher than that of metal calipers. [Measurement accuracy]: measurement range: 0-6 "/0-150mm; resolution: 0.01"/0.1mm; Accuracy: 0.2mm/0.01. A perfect and accurate caliper measuring tool, suitable for home/jewelry/DIY measurement, please pay attention. This kind of caliper is not suitable for professionals with high technical accuracy. [Inch/mm conversion]: Use a digital caliper to switch freely between inches and millimeters. The switching function of the two units can meet different needs. It is more convenient and widely used to measure the value you want. [LCD and automatic shutdown]: high-quality and reliable digital caliper, LCD display reading is more convenient, fast, and easy to get accurate results, which is automatically turned on and turned off after 5 minutes of use. It is battery powered, including pre installed batteries and backup batteries. [Zeroing function]: intelligent design, you can press the "Zeroing" button anywhere in the measurement to easily reset to zero and start a new measurement. It is very suitable for differential measurement. It is convenient to measure and carry.