Fowler's Mag Base & Electronic Indicator Set Indicator Features include... 0-1" / 25mm Measuring Range 0.0005" / 0.01mm Resolution Direct Inch/Metric Conversion Auto Off feature 2 1/4" dial face Lug back and 3/8" stem diameter Absolute/incremental reading Floating zero Carbide tipped point Magnetic Base Features include... 85 lb. pull magnet Fine Adjustment V-base for mounting on rounded surfaces Magnetic Indicator Back Features include... Use for positioning the indicator on most metal surfaces. Protective coating