Mitutoyo 468-979 Digital Holtest Inside Micrometer Head Set 2-4 Inch Range

The Mitutoyo 468-979 Digital Holtest is a precision inside micrometer head set designed for accurate measurement of internal dimensions, bore diameters, and hole sizes in the 2 to 4 inch (50.8 to 101.6mm) range. This three-point internal measuring instrument features advanced digital readout technology for quick, reliable measurements in inspection and quality control applications.

Key Features:

• TiN Coated Contact Points: Titanium nitride coated measuring contact points deliver exceptional durability and impact resistance while enabling measurements to the bottom of blind holes
• Large LCD Display: Easy-to-read digital readout provides clear measurement values and eliminates parallax errors associated with analog gauges
• Ratchet Stop Mechanism: Built-in ratchet stop ensures consistent measuring force for repeatable, accurate results
• Three-Point Contact: Self-centering three-point contact design automatically centers the gauge in the bore for precise measurement
• Metric and Inch Display: Dual unit capability allows switching between inch and millimeter measurements

The Holtest digital head set is ideal for measuring cylinder bores, bearing housings, machined holes, and other internal dimensions where precision is critical. The head set design allows for use with various extension rods to accommodate different measurement ranges. Manufactured to Mitutoyo's exacting quality standards, this instrument is suitable for machine shops, manufacturing facilities, and inspection departments requiring reliable internal measurement capabilities.