Measure groove diameter Resolution: 0.01mm/0.0005" Buttons: on/off, set, mm/inch, preset (+, -), Battery CR2032 Made of stainless steel Optional accessory: depth stop(code 6143, for calipers with c=16mm) No dust/waterproof, preset (no need to add th Measure groove diameter Resolution: 0.01mm/0.0005" Buttons: on/off, set, mm/inch, preset (+, -), Battery CR2032 Made of stainless steel Optional accessory: depth stop(code 6143, for calipers with c=16mm) No dust/waterproof, preset (no need to add the width of the jaws on the reading), with data interface Data output cable (optional) 7315-21, 7302-21