Material The digital calipers are made of plastic and carbon fiber composite material, which is strong, lightweight and corrosion resistant . Lightweight and compact, this scratch-resistant gauge is easy to use and sturdy. The lightweight construction provides excellent protection against plastic body drift due to hand shake and provides a good balance between glide length and value retention. The edges of digital calipers are not sharp enough to cut people or objects. Versatile digital calipersClassic digital calipers can easily and accurately measure OD, ID and depth. It is a tool suitable for daily life, widely used in schools, households, laboratories and factories. Measuring accuracyThe calipers are equipped with an LCD display to help you to obtain results quickly. Vernier caliper measuring range: 0 - 6" / 0 - 150 mm; resolution: 0.01" / 0.1 mm; Accuracy: 0.2mm/0.01". Please note that it is not suitable for professional use with extreme precision. Usage You need to press the red power button before using the caliper, then select the appropriate jaw and length unit according to the item to be measured, so that you can start measuring. With the reset function, the calipers can be recalibrated at any time to increase accuracy. Millimeter/inch conversion function can be adjusted to suit different user habits. On/off button and automatic shutdown after 5-8 minutes help you save battery power. Package Contents Electronic caliper, an additional LR44 1.5V spare battery and a battery built into the caliper. Digital caliper with battery The caliper is equipped with an LR44 battery, and an LR44 battery is provided as a gift. The standby time is longer than other LR44 batteries, which can respond to your measurement needs. Unit conversion button Convert between millimeters and inches with the press of a button. < p> Large LCD Display Featuring an oversized LCD screen that displays instant, clear measurement data with easy-to-read digital numbers. Lightweight ABS The digital caliper is made of high-quality ABS material, which has been finely polished, and the caliper is smooth, tough and wear-resistant. Also lightweight and easy to carry. Unit conversion You can switch between millimeter and inch units to meet your different needs. units. One key to zero Simply press a button to reset the value to 0.