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

Dynabrade 94990 1/4" Female Composite-Style Coupler with 1/4" Male Plug Assembly
Standard Abrasives 712644, A/O Tapered Cone Point, K-110 180, 7100166526, 100 per case 
