Mitutoyo 468-976 Digimatic Holtest 3-Point Internal Micrometer 0.275-0.5 Inch Range

The Mitutoyo 468-976 Digimatic Holtest is a precision 3-point internal micrometer designed for accurate measurement of inside diameters, bore diameters, and internal grooves. This digital measuring instrument covers a measurement range of 0.275 to 0.5 inches (6.925 to 12.7mm) and features three individual measuring ranges: 0.275-0.35 inches, 0.35-0.425 inches, and 0.425-0.5 inches for optimal accuracy across the full span.

Key Features:

• Digimatic digital readout for easy, precise measurements
• 3-point contact design ensures accurate centering and consistent measurements
• TiN (Titanium Nitride) coated measuring contact points provide excellent durability and impact resistance
• Contact points allow measurement to the bottom of blind holes
• Includes 0.35 inch and 0.425 inch diameter setting rings for calibration
• Extension rod included for extended reach applications
• Measurement range: 0.275-0.5 inches / 6.925-12.7mm

The Holtest design uses three symmetrically arranged contact points that automatically center the instrument in the bore, eliminating alignment errors common with 2-point micrometers. The titanium nitride coating on the contact points significantly extends tool life and maintains measurement accuracy even in demanding production environments. Ideal for precision machining, quality control, and inspection applications where accurate internal diameter measurements are critical.