Chose Kynup 12inch Digital Caliper will not disappoint you. Believe us, you will find out that the caliper meeting you demand. The caliper is designed with stainless steel body, a knurled thumb roller and locking screw that ensures smooth sliding and accurate positioning when measuring The caliper is with accuracy to ±0.0015”/0.03mm, and resolution to 0.0005"/0.01 mm. Press to set to zero at any position to measure the next section Auto turn-off after 7 min of inactive operation. If you find the readings are not accurate, please slide the LCD screen to the left end (“0” on the scale body), and then press the zero button for a few times