WATERPROOF & STAINLESS STEEL MATERIAL: The waterproof digital caliper is constructed of finely polished stainless steel, waterprof, anti-rust,which has knurled thumb roller and locking screw ensure smooth sliding and accurate positioning in use EASY SWITCH FROM INCH/MILLIMETER: This 6 inch digital caliper is easy to operation with one buttons. One button quick change between two measuring modes: inch, millimeter ACCURATE CALIPER MEASURING TOOL: digital caliper measurement Range: 0 - 6 and 0 - 150mm; Resolution: 0.0004 / 0.01mm; Accuracy: 0.0007 / 0.02mm. The digital micrometer glides smoothly and allows you to set zero and measure at any point of scale VERSATILITY: Vernier caliper digital measures inside, outside, depth and step with two sets of jaws and the probe. And it can Auto Shut Off after 5 minutes of no operation. Extra large LCD screen for easy and clear reading. Besides, the digital caliper comes with a black portable strong case for easy storage, pressure resistant and shock