Precise Measurement: Measuring Range: 0 - 6''/ 0 - 150mm; Resolution: 0.01/ 0.1mm; Accuracy: 0.2mm/0.01. Perfect and accurate caliper measuring tool for home/DIY measurements. Please use stainless steel digital calipers for more accurate measurement 4 Measuring Modes: This digital caliper can be used to measure inner and outer diameters, depth and steps, with two sets of jaws and a probe. Battery powered with pre-installed and backup batteries Inch/mm conversion: Quickly switch between inches and millimeters with one key, definitely saving your time. Made of strong plastic carbon fiber composite for durability and portability Zero function: Smart design allows you to zero at the touch of a button and start a new measurement at any point on the scale, ideal for differential measurements Large LCD Screen and Auto Off: Large, easy-to-read LCD display helps you get precise results quickly and easily, and automatically shuts off after 5 minutes of inactivity to save battery power Specification: Material: Carbon Fiber Composite Dimensions: 9.4 x 3 x 0.6 inches Weight: 2oz Measuring range: 0-6 inches / 0-150 mm Accuracy: 0.2mm/0.01 Resolution: 0.01/0.1mm Battery: 1.5V LR44 button battery