The Precision electronic digital caliper 6 inch measurement range is 0–6 inch and 0 mm–150mm. This digital electronic calculator with an LCD screen and a 6-inch range is a perfect and accurate measuring tool for shop or home gunsmithing and DIY measurements. This 6-inch electronic digital caliper has four measuring modes. The digital caliper can be used to measure inside and outside diameter, depth, and step with two sets of jaws and a probe. Calipers have an inch/mm conversion: one button quick switch between Standard American and metric. T The Digital Caliper buttons are made of rugged plastic carbon fiber composites that are durable and portable. Zero setting function:smart design allows you to set zero with an easy touch of a button and start a new measurement at any point of the scale, ideal for differential measuring. Caliper's smart design allows you to set zero with an easy touch of a button and start a new measurement at any point of the scale, making it ideal for differential measuring. The digital caliper has a large LCD screen and an auto-off function. The large and easy-to-read LCD display helps you get precise results quickly and easily. The auto-shutdown saves batteries after 5 minutes of no operation.