INSIZE Electronic Back Jaw Caliper with Interchangeable Tips This unique gage with its 6 pairs of ball tips allows you to measure a variety of hole to hole distances. Features include... 12" / 300mm Measuring Range 0.0005" / 0.01mm Resolution + 0.0012" Accuracy 15.7" Overall Length Buttons: zero, power on/off, in/mm, preset Data Output Hardened stainless steel Includes plastic box Ball Tips included in Pairs... 1/16" Diameter, Ruby Ball Tips 1/8" Diameter, Stainless Steel Tips 3/16" Diameter, Stainless Steel Tips 1/4" Diameter, Stainless Steel Tips 3/8" Diameter, Stainless Steel Tips 1/2" Diameter, Stainless Steel Tips