The 1120 Digital Inside Groove Caliper Vernier Calipers. The Caliper is made of stainless steel for longer tool life and durability from machine shop wear. With optional SPC cable data output. Sizes range up to 300mm (12) . Measure internal groove diameter. Resolution: 0.01mm/0.0005. Button function: on/off, set, mm/inch, preset (+, -) . Automatic power off (move digital unit to turn on) . Battery CR2032. Data output. Made of stainless steel. Optional Accessory: depth stop (code 6143) , data output cable (code7302-SPC5A) .