The Mitutoyo mechanical Holtest internal micrometer set includes complete gages (micrometer head units and measuring heads) for each size. Three alloy steel anvils evenly spaced at 120° for true alignment of the axis bore for accurate, easily repeatable measurements. Hardened steel spindles with a carbide ball and cones with a carbide pin ensure accuracy and durability when extending and retracting the anvils. The holtests ratchet stop mechanism provides a constant measuring force on the hardened steel spindle to ensure accurate, even measurements.

■ Available in Metric and Inch models
■ Contact points are constructed of hardened steel
■ Optional extension rod allows for measuring deep holes
■ Optional setting rings for zero point adjustment are available
■ Design allows for measurements closer to the bottom of blind bore 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