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Mitutoyo 3-point Holtest internal micrometers - a self-centering and accurate solution for measuring internal diameters Mitutoyo's Holtest series of 3-point internal micrometers are designed for accurate and repeatable internal diameter measurement when traditional two-point measurement is no longer sufficient. The three-point measuring geometry automatically centers the micrometer on the center line of the hole, and the measuring surfaces are positioned at 120° angles. This self-centering design minimizes user errors and ensures that the measurement aligns with the true diameter of the hole - quickly and reliably. Holtest models are widely used in machine shops, quality control, metrology laboratories, and industrial applications where the accuracy of the internal diameter directly affects the performance and fit of parts. The series is suitable for both shallow and deep holes, bushings, tubes, and cylindrical parts. Mitutoyo's main series of Holtest models utilize carbide precision lapped measuring surfaces and a mechanical ratchet stop mechanism that stabilizes the measuring force and improves measurement repeatability. The Economy series Holtest models offer a cost-effective and easy-to-use alternative for general internal measurements - without digital features, yet maintaining good accuracy with tool steel measuring surfaces.
