Insize 1121-500A, DIGITAL INSIDE POINT CALIPER, 40-500mm/1.57-20″, 6928640385100

Resolution: .0005″/0.01mm.
Measure groove diameter.
Buttons: on/off, set, inch/mm, preset (+, -).
Automatic power off, move the digital unit to turn on power.
Battery CR2032. Data output.
Made of stainless steel.
Optional accessory: depth stop (part no. 6143), data output cable