Fowler / Sylvac Hi-Accuracy Digital Indicator without Spring Tension Specifications include... 2" / 50mm Measuring Range 0.000005" / 0.0001mm Resolution 0.00006" / 0.0015mm Accuracy 0.00001" / 0.0002mm Repeatability Features include... Mixed ceramic bearing / ball bearing system IP54 Rated Protection Includes Spindle Lifting Attachment Without Spring Tension 8mm Stem Diameter Includes LIFETIME Warranty