Feature:1. The digital calipers are made of a durable, lightweight and corrosion-resistant plastic carbon fibre composite. This lightweight and compact, scratch resistant gauge is easy to use and durable. The lightweight design provides excellent protection against dripping off the plastic body due to hand shocks and provides a good balance between sliding length and value stability. The edges of the digital calipers are not sharp enough to cut people or objects.2. classic digital calipers can measure outer diameter, inner diameter and depth easily and accurately. It is a suitable tool for daily life.3. calipers are equipped with an LCD display so you get results quickly. Measuring range of the calliper: 0 - 6 inches / 0 - 150 mm; Resolution: 0.01 inches / 0.1 mm; Accuracy: 0.2 mm / 0.01 inches. 4. you need to press the red on/off button before using the calliper, then choose the appropriate measuring jaw and length unit according to the object to be measured, so you can start measuring. With the reset function, the button compass can be re-calibrated at any time to increase accuracy. The millimeter/inch conversion function can be adjusted to suit different user habits. The on/off button and automatic shut-off after 5-8 minutes help you save battery power.Specification:Product name: Electronic digital caliperCaliper length: 179/237mmProduct range: 0-100/0-150mmClaw length: outer:30.5/40, inner:12.5/16(mm)Product material: carbon fiber plasticBattery model: LR44/SR4441.5v button batteryResolution: 0.1mmPacking List:1 X Electronic digital caliper1 X Storage box