Usage Tips:Electronic Micrometer Micrometer Wall Thickness Micrometer Digital Micrometer 0-25mm 0.001MM Measuring Range: 0-25mm (1") wide measuring range and 0.001mm (0.00005") resolution. Shaft diameter: 6.5mm, hardened stainless steel. LCD display: LCD electronic digital display, easy to read. 3V button battery: large capacity CR2032 lithium battery, durable and safe. Uses: mm to inch conversion, zero setting for each measurement, incremental or absolute measurements. Instruct: On\Off...Set: Switch and setting button. Short press the button to turn the machine on and off, and long press the button to reset to "0.25,50.75". Press and hold to display multiple zero values alternately. If one of the zeros is displayed, release the button. The zero value is the currently displayed value. Reset: press the button. Data are standard starting values (0.25,50.75). ABS...in mm/inches: relative and absolute conversions, metric and inch conversions. Briefly press this key to perform the conversion. Features: Large LCD screen, clear image. Hard metal probe, durable. The device can measure correlated and relative measurements. Automatic shutdown after 5 minutes. Temperature and humidity Operating temperature: 0-40C Working humidity: