Electronic Indicator Probe with IP54 Protection SPI's newest Digital Indicator Probe. Features include... 2" / 50.8mm Measuring Range 0.0005" / 0.001mm Resolution 0.0003" Accuracy Flat Back Attached, Lug Back included 3/8" Stem, 4-48 Threaded Tip IP54 Rated Protection SPC Output Attachable Finger Lift included Furnished in fitted case Ground Shipping Only This gage contains lithium batteries. UPS will only ship products with lithium batteries via Ground shipping ONLY.