Measure groove diameter. Resolution: 0.01mm/0.0005". Buttons: on/off, set, mm/inch, preset (+, -). Automatic power off, move the digital unit to turn on power. Battery CR2032. Data output. Made of stainless steel. Optional accessory: depth stop (code 6143), data output cable (code 7306-20, 7302-SPC1A/SPC1B, 7305-SPC2).