Dr.Meter Stainless Steel Electronic Digital Caliper With Extra Large Lcd Screen,"/Millimeter Conversion, Auto Off Measuring Tool, Black[06"] Measurement in inches, decimals, millimeters range: 0-6" accuracy: 0.001" repeatability: 0.0005 resolution: 0.0005"/0.01mm/1/128" Highly accuracy and repeat-ability: there isn't any "slop" or "wiggle room" between the measuring body and the ruling body Huge clear digital display, largest display of all of the calipers and covers most of the measuring body. Very smooth over-all Well-polished stainless steel frame with knurled thumb roller and locking screw ensure smooth sliding and accurate positioning in use Zero function allows measurements the caliper to be reset to zero when opened, allowing measurements of "stepped" features from a common datum. Auto Off: auto shut off after 5 minutes of no use to save battery life.