Fowler Electronic Screw Thread Micrometer Specifications include... 3-4" / 75-100mm Measuring Range 0.00005" / 0.001mm Resolution + 0.00008" / 0.002mm Accuracy 24 - 3.5 TPI / 1 - 7mm Thread Range Features include... 60° Measuring Anvils IP65 Rated Protection Heat Insulated Frame Friction Thimble Supplied in fitted case