INSIZE Electronic Interchangeable Point Caliper Features include... 1" - 12.7" / 24 - 324mm Measuring Range (approximate) 0.0005" / 0.01mm Resolution + 0.0016" Accuracy 3.543" Jaw Length Includes 4 pairs of Interchangeable Points Includes Zero Setting Block Buttons: zero, power on/off, in/mm Data Output Hardened stainless steel Includes plastic box