Insize 2188-55, DIGITAL RADIUS GAGE, .16-2.09″/4-53mm, 6928640381911

Resolution .0005″/0.01mm
Measure radius of external arc, arc angle of measured surface should be larger than 60?
Display radius value, no need to calcuate
Button function: on/off, zero, data preset, inch/mm
Keep preset data and tolerance data in memory after restart.
CR2032 battery, automatic power off
Stainless steel base