1,Made from engineering plastic, this gauge is durable and has a long service life 2,Designed with magnet on the standing feet so it would firmly hold onto ferromagnetic surfaces 3,Dual-purpose gauge can be used for measuring object height and also aperture depth 4,This gauge supports mm, inch and fraction inch unit that will meet you different unit requirement 5,There is a button that you can use to switch between absolute(ABS) and incremental(INC) measuring mode Features: Made from engineering plastic, this gauge is durable and has a long service life. Designed with magnet on the standing feet so it would firmly hold onto ferromagnetic surfaces. Dual-purpose gauge can be used for measuring object height and also aperture depth. This gauge supports mm, inch and fraction inch unit that will meet you different unit requirement. There is a button that you can use to switch between absolute(ABS) and incremental(INC) measuring mode. Specifications: Material: Engineering plastic Measuring Range: 0-80mm Resolution:  0.05mm or 0.002" Precision: 0.1mm or 0.004" Unit: mm or inch or fraction Operating Temperature: 0-50℃ Battery: 1pc CR2032 3V(Not included) Package Includes: 1 x Gauge(Battery is Not included) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.