INSIZE Electronic Inside Groove Long Jaw Caliper Features include... 1.18" - 12" / 25 - 300mm Measuring Range 0.0005" / 0.01mm Resolution + 0.0020" Accuracy 4.528" Jaw Length 0.079" wide x 0.394" long inside tips For measuring narrow grooves and small recesses Buttons: zero, power on/off, in/mm Data Output Hardened stainless steel Includes plastic box