SPI Dial Indicator IP54 Rated Protection Features Include... 0-0.4" Measuring Range Dial Diameter: 2-9/32" Graduation: 0.001" 0-50 Dial Reading 0.0015" Accuracy .05" Range per Revolution 3/8" Stem Diameter 4-48 Threaded Tip Revolution Counter Lug Back & Flat Back included Supplied with tolerance pointers Furnished in fitted case Includes Certificate of Calibration