SPI Electronic Travel Indicator Features include... 1" / 25.4mm Measuring Range 0.00005" / 0.001mm Resolution + 0.0002" Accuracy Flat Back 3/8" Stem, 4-48 Threaded Tip Auto Shut Off Includes Certificate of Calibration Functions include... Preset Tolerance MIN, MAX Ground Shipping Only This gage contains lithium batteries. UPS will only ship products with lithium batteries via Ground shipping ONLY.