Precise measurement: Measuring range: 0 - 6''/ 0 - 150 mm; Resolution: 0.01"/0.1mm; Accuracy: 0.2mm/0.01". The perfect and accurate caliper measuring tool for home/DIY measurements. Please choose a stainless steel digital caliper for more accurate measurement. 4 measurement modes: This digital caliper can be used to measure inner and outer diameters, depths and steps, with two sets of jaws and a probe. The battery is powered by a pre-installed battery and a backup battery. Inch/mm conversion: Quickly switch between inches and millimeters with one click, saving you time. Made of strong, durable and portable plastic carbon fiber composite. Zero function: The clever design allows you to zero at the touch of a button and start a new measurement at any time on the scale, ideal for differential measurements. Large LCD Display and Auto-Off Function: The large, easy-to-read LCD display helps you get accurate results quickly, easily, and automatically after 5 minutes of inactivity Off to save battery power. Features: Premium Material: It measures without scratching your valuables, it works for you for many years. Accurate Readings: Rigorously tested to ensure accurate measurements down to 0.01 inches. < p> Zero: Press to zero at any position and continue to measure the next segment. Unit conversion: Press the blue button at the top to easily read inches and millimeters. Large LCD screen: The digital display can be read instantly, which is more convenient. p> Auto On/Off: Automatically turn on when scanning, and turn off automatically after 5 minutes of inactivity. 4 measurement methods - Outer measurement: measure the outer diameter of an object with a long claw. - Internal measurement: Measure the diameter of an object internally with the upper jaw. - Depth Measurement: Measure the depth of small objects that are difficult to reach with a long probe. - Step Measurement: Measure height/length by design step. Specifications: Material: Carbon Fiber Composite Dimensions : 9.4 x 3 x 0.6 inches Weight: 0.26 lbs Measurement range: 0-6p oz/0-150mm Accuracy: 0.2mm/0.01" Resolution: 0, 01"/0.1 mm Battery: 1.5 V LR44 coin cell battery Tips: 1 . Before first use, please remove the white insulating strip inside the battery cover, otherwise the electronic caliper will not work. 2. Digital calipers are only suitable for household measurement, such as jewelry, gadgets and other household items. If it is an industrial measurement, please purchase a more professional and accurate measurement tool in the professional field. 3. If the reading is not accurate , slide the LCD all the way to the left ("0" on the scale) and press the reset key. If you have more questions, please feel free to write to us.