Holtest (Type II) Series 368-Three-Point Internal Micrometers

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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)