The Mitutoyo mechanical Holtest internal micrometer features three hardened-steel anvils evenly spaced at 120° for true alignment of the axis bore for accurate, easily repeatable measurements. Contact points are coated with Titanium Nitride (TiN)* for added durability and precision. The holtest’s ratchet stop mechanism provides a constant measuring force on the hardened-steel spindle to ensure accurate, even measurements.

■ Available in Metric and Inch models
■ Optional extension rod allows for measuring deep holes
■ Optional setting rings for zero point adjustment are available
■ 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
■ Ratchet Stop for constant force.

* Models under 5-6mm / .24-.28″ are carbide