Fowler High Precision Flex Arm Mag Base features: Corrosion resistant chrome plated flex arm 85 lb. pull magnet Holds rigidly in almost any position. V-base for mounting on rounded surfaces. Magnetic Indicator Back features: Use for positioning the indicator on most metal surfaces. Protective coating Indi-X Blue Indicator features: Direct Inch/Metric Conversion 1"/25mm travel Auto Off feature 2-1/4" dial face Lugback and 3/8" stem mountings Resolution .0005"/.01mm Tolerance indicators Absolute/incremental reading Floating zero Carbide tipped point w/4/48 thread