Accurate Measurement: One button can quickly convert two measuring unit (INCH/MM). Measuring Range:0 - 150mm (6') / Resolution: 0.01mm (0.0005')/Accuracy: ±0.02mm (0.001') STAINLESS STEEL MATERIALt: The vernier caliper is made of high-strength stainless steel and is waterproof, stain-proof and oil-proof. The service life of this stainless steel digital caliper is longer than that of calipers with plastic or carbon fiber parts. The ergonomic design brings you a comfortable feeling. Powered by battery, comes with a pre-installed battery and 2 spare batteries for gift. 3 Units Conversiont: These Digital Calipers have a one-key button to quickly switch from inches (inch), fractions (F), millimeters (mm). Press the on/off button, slide the digital caliper to anywhere, then you can read the values on the display. And you can reset it to zero by zero button. 4 Measuring Wayst: The digital caliper has 4 measurement modes, which can be used to measure inside and outside diameter, depth, and ste