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FEATURES

 These Holtests are versatile, self-centering three-point internal micrometers for the accurate and efficient direct-measurement of internal diameters. Three anvils, evenly spaced at 120° apart, contact the internal wall surfaces and find true alignment with the axis of the bore for accurate ID measurement.

• TiN-coated measuring contact points(over 6mm/.275″ range models) provide excellent durability and impact resistance and allow the instrument to measure right to the bottom of a blind hole.
• Highly durable because of carbide-tipped contact points (anvils).
• Measurement can be taken closer to the bottom of the blind bore.
• Can measure deep holes using an Extension rod (optional) which is available on models over 6mm (.275″) measuring range.
• With Ratchet Stop for constant force.
• Setting Rings for zero point adjustment are optional.
• Supplied in fitted plastic case up to 100mm / 4”. Over 100mm / 4” supplied in wooden case.

Technical Data
Graduation: 0.001mm, 0.005mm*,
.0001″ or .0002″* (*over 12mm or .5” models)