The μMaxum II digital indicators from Mahr Federal feature dynamic max, min, and total indicator reading; two-point difference measurement; multiplier factor for ratio measurements; indicator serial number identification; resolution to 10 μin; selectable continuous output; and enhanced battery life. Resolution is selectable in increments from 0.001 in to 0.00001 in. Two-point difference measurement allows comparison of different readings or calculation of measured values. The addition of multiple factors for ratio measurements allows chordal-type measurements, useful for making inner/outer diameter measurements using a V-plate, or for gauge fixtures using lever-type nondirect contacts. The μMaxum II XL enables longer measuring ranges. The unit weighs as little as 6 oz.