Technical Data:
Digital inside groove calipers
Non waterproof
Measure diameter or distance of grooves
Resolution: 0.01mm/0.0005in
Buttons: on/off, set, mm/inch, preset (+, -)
Automatic power off, move the digital unit to turn on power
Battery: CR2032
Made of stainless steel
Range of upper jaw: 10-200mm/0.39-8in
Range of lower jaw: 3-200mm/0.12-8in
Accuracy: +/-0.03mm

Dimensions:
Overall length=312mm
Drawing dimensions (unlabeled)=2mm; 1.5mm; 16mm; 16mm; 9mm; 21mm; 13mm; 2.5mm; 3mm

Remark:
Built-in wireless; receiver code 7315-2/3/6/7/8/9 is needed