The Mitutoyo 209-910 Internal Digimatic Caliper Gage has the following specifications: Range: 1.57-3.54"/40-90mm Resolution: .0002"/0.005mm Accuracy: .002"/0.06mm Measuring Contact: Ball .08"/2mm dia. Mass: 420g Features: Versatile ID measuring gages for holes diameters, groove thickness, tube thickness, and hard-to-reach dimensions. The Digimatic. Caliper Gages provide error-free LCD readings as well as data output for SPC analysis. Technical Data: Resolution: .001?, .0005?, or .0002? 0.01mm, 0.02mm, or 0.005mm Display: LCD Analog / Digital Power Supply: AA Battery (1pc) Battery life: Approx. 350 hours Measuring Force: 0.7 - 1.7N Dust/Water protection level: IP67 Provided with inspection certificate. Function: Zeroset, Preset, Auto power OFF, Inch/Metric, conversion Data hold, Max/Min value holding, Data output