The Fowler xtra-value cal digital caliper has accuracy of 0.0016"/0.04mm with 0.0005"/0.01mm resolution, and it has a hardened stainless steel frame. The digital, single-value readout LCD Super large display with hold feature shows either inch or metric units for versatility when measuring. This caliper has a zero setting and absolute and incremental modes for taking intermediate or differential measurements. It has direct metric/inch conversion for versatility. The knurled lock screw holds the sliding jaw in position and helps ensure a consistent measurement. This caliper is used for measuring inside dimensions (ID), outside dimensions (OD), depth, and step. It comes with a vinyl pouch for storage. Digital calipers are measuring instruments commonly used for inspection in manufacturing to provide the precise measurements of an object. A pair of jaws attached to a long beam with a marked scale is used to take inside, outside, and step measurements. Digital calipers can take differential measurements that are used to determine the difference in measurements between two objects, by zeroing the display at any point along the scale. Some digital calipers can switch between standard and metric units, and some can output readings to a computer or printer for recording measurements. Compared to dial calipers, digital calipers provide measurements that are faster, easier, and more error-free, but they are more fragile mechanically and electronically, and do not resist coolant well. Digital calipers are commonly used in fields such as metalworking, mechanical engineering, machining, carpentry, and medicine. This product has with full 1 year warranty. If you experience any problem contact Fowler directly for warranty claims. Fowler precision, an American company manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.