Digital caliper is a device that can take highly accurate measurement of an object inside diameter, outside diameter and depth. It has a measuring length of 150mm that can automatically convert between standard and metric measurement systems.its has an easy to read digital display and a high level of accuracy. Manufactured from hardened stainless steel, fine adjustment roller that allow precise measurement to be taken quickly and easily. It is packed in a strong plastic storage case with spares LR44 battery.