4 measurement modes: This digital caliper can be used to measure inner and outer diameters, depth, and step, with two sets of jaws and a probe. Battery powered, equipped with pre-installed batteries. Precision measurement: measurement range: 0-150mm; Resolution: 0.1mm; Accuracy: ±0.2mm. A reliable and accurate measurement tool suitable for household or DIY use. Inches/Millimeters conversion: Quickly switch between inches and millimeters with a single button press, saving time. Made of sturdy and durable carbon fiber composite plastic. Zero point adjustment function: The design allows you to reset the display to zero at any position, enabling easy differential measurements. Large LCD display and automatic shutdown: A large, easy-to-read LCD screen helps you obtain accurate readings quickly. The device automatically powers off after 5 minutes of inactivity to conserve battery life.