INSIZE Inside Knife-Edge Digital Caliper Features include... 0.9" - 12" / 24 - 300mm Measuring Range 0.0005" / 0.01mm Resolution + 0.0025" Accuracy 5.906" Measuring Depth For measuring diameter of deep step holes Buttons: zero, power on/off, in/mm Battery CR2032 Data Output Hardened stainless steel Includes plastic box