Crankshaft Distortion Gage, Balanced Reading, Dial Size 1.450 In., Range 2.375 to 18 In., Graduations 0.0010 In., Dial Reading 0-20-0, Range per Revolution 0.040 In., Long Form Calibration Certificate No, Dial Color White, Bearing Type Plain, Back Type Lug, Contact Point Dia. 1/4 In., Bezel Lock Yes, Features Designed in collaboration with Hartford Steam Boiler. Gage is used by their inspectors to check the distortion of engine shafts and frames