Surface Smoothness Dial Test Indicator - Bi-Directional Lever Arm - 0.03"-0.0005" Our Part # ALL-52030 Measuring range: 0-0.03", graduation: 0.0005", reading: 0-15-0 Dovetail mount top, back and front. Precision pivot bearing. Contact point ball diameter: 0.080" Includes: fitted case and two stems - 3/8" & 5/32"