IP54 GRADE PROTECTION: Heavy-duty stainless steel digital caliper with IP54 grade protection, sturdy frame and a lockable head, which can resist water, dust, oil, and rust. It is very suitable for engineers, carpenters, households, professionals, etc. | ACCURATE MEASUREMENT: Measuring range: 0 -6" / 0-150mm; Accuracy: ± 0.001"/ 0.02mm; Resolution: 0. 0005"/0. 01mm. Compared with ordinary calipers, digital calipers provide faster, easier, and more error-free measurements, better provide accurate measurement of the objects. | ZERO SETTING & AUTO SHUT-OFF: The zero button allows you to set the zero adjustment at any slider position along the scale for measuring the next section. The digital caliper will automatically turn-off after 5 minutes of inactive operation. And when the thumb wheel moves, the display screen restores power. | 4 MEASURING TYPES: Digital caliper can measure internal, external, depth and step length values to achieve versatility, including a protective case and 2pcs of 3V CR2032 lithium batteries. | SERVICE POLICY: Backed by a Sangabery carefree service for every purchase. If you don't like this product, contact us, we promise to refund unconditionally.