Permanently calibrated Positive visual and audible indicators to designate thickness reading is established "V" grooves in probe housing and gauge base to allow correct positioning on cylindrical objects GO/NO-GO button can be preset for rapid measurement Probe contact and dial rotation all in a one finger operation Compact, lightweight, independent of gravity - can be used in any position Stable overall design, positive positioning, no pivoting tendencies during measurements Can be fully supported or with only front probe area contacting surface Functions on a permanent rare-earth cobalt magnet, no battery Rugged housing, not affected by mechanical shock, water, acid or solvents Highly wear resistant carbide measuring probe Measuring range: 0 to 80 mils Specifications Display Type Analogue Measuring Range 0"-0.08"