Mitutoyo 468-279 Digimatic Holtest 3-Point Internal Micrometer 9-10 In with SPC Output

The Mitutoyo 468-279 Digimatic Holtest is a high-precision 3-point internal micrometer designed for accurate bore measurement in the range of 9–10 inches (228.6–254 mm). With a resolution of 0.0001 inch (0.001 mm), this instrument delivers exceptional measurement accuracy for demanding industrial and quality control applications. Digital output via Mitutoyo's SPC (Statistical Process Control) interface enables seamless data transfer to compatible data collection systems and software.

The Holtest design uses three equally-spaced contact points that automatically center the instrument within the bore, ensuring consistent, repeatable readings regardless of operator technique. This self-centering capability eliminates the rocking errors common with two-point bore gauges, making the 468-279 ideal for tight-tolerance inspection tasks.

Key Features:

• Measurement Range: 9–10 inches (228.6–254 mm)
• Resolution: 0.0001 inch / 0.001 mm
• Digimatic (Digital) LCD Readout: Large, easy-to-read display with inch/mm switchover
• SPC Data Output: Compatible with Mitutoyo's SPC data collection systems for statistical process control and quality documentation
• Ratchet Stop: Provides constant, repeatable measuring force to eliminate operator-variable errors
• TiN (Titanium Nitride) Coated Measuring Contact Points: Offers excellent durability, impact resistance, and allows measurement to the bottom of blind holes
• 3-Point Self-Centering Design: Automatically aligns to the true bore center for highly accurate and repeatable readings
• Metric/Inch Switchover: Displays measurements in both imperial and metric units

The Mitutoyo 468-279 is built to the exacting standards Mitutoyo is known for worldwide, making it a trusted choice for machinists, quality engineers, and metrologists who require reliable large-bore internal measurement with digital data output capability.