• Available in Metric and Inch sets
• Optional extension rod allows for measuring deep holes
• Scale on thimble and sleeve is laser etched for easier reading in all conditions
• Holtests up to 100mm / 4″ diameter measurements supplied in a fitted plastic case
• Holtests over 100mm / 4″ diameter measurements supplied in a wooden case

The Mitutoyo mechanical Holtest internal micrometer set includes complete gages (micrometer head units and measuring heads) for each size. Three hardened-steel anvils evenly spaced at 120-Deg allow for true alignment of the axis bore for accurate, easily repeatable measurements. The holtest’s ratchet stop mechanism provides a constant measuring force on the hardened-steel spindle to ensure accurate, even measurements.