This set allows you to use either the included Magnetic Stand or the Magnetic Back with the Fowler Dial Indicator, mounting to most metal surfaces. Indicator Features Include... 1" Travel .001" Reading .100" Continuous Reading 2.25" Dial Diameter Carbide Tipped Point Black Face 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