Starrett S78XTFZ 78XT Global Series® mechanical bore gage measures 2 to 4 inches with 0.00025-inch graduations and 0.0002-inch resolution. Tungsten carbide contact points provide wear resistance. Accuracy is ±0.0002 inch. Probe depth ranges from 3-1/16 to 4 inches.

The Starrett 78XT Series Internal Micrometer features extended travel, reducing the need to exchange anvils. The ground contact point seats the internal micrometer faster and more accurately than the spherical contacts found in other gages. The rugged and accurate internal micrometer is available individually or in economical sets from .040-12" (1-300mm). SET, 2 - 4" Range, w/3 Point Carbide Contact.

Features

• Wide measurement range without changing anvils
• Tungsten carbide measuring faces on all 3-point heads above 1/2 in (12.5 mm)
• Ratchet stop ensures consistent measurements
• Self-centering contacts for true readings
• Blind bore measuring capability above 1/2 in (12.5 mm) diameter
• Extensions available up to 6 in (150mm) for deep hole measuring
• 3 heads and 2 rings
• 3 point contact