The 1186 Insize Digital Arc Radius Vernier Caliper. The Caliper is made of stainless steel for longer tool life and durability from machine shop wear. With optional SPC cable data output. Measurement range from 5-200mm (0.2-8). Measure the radius of arc less than half round. Resolution: 0.01mm/0.0005. Button function: on/off, zero, mm/inch. Automatic power off (move digital unit to turn on). Battery CR2032. Data output. Made of stainless steel. Optional Accessory: data output cable (code7302-SPC5A).