Mitutoyo 368-780 Series 368 3-Point Internal Micrometer Mechanical Holtest (Type II), 250-275 mm Range, 0.005 mm Graduation

The Mitutoyo mechanical Holtest internal micrometer features three alloy steel anvils evenly spaced at 120° for true alignment of the axis bore for accurate, easily repeatable measurements. A hardened steel spindle with a carbide ball and cone with a carbide pin ensure accuracy and durability when extending and retracting the anvils. The holtest's ratchet stop mechanism provides a constant measuring force on the hardened-steel spindle to ensure accurate, even measurements.

Features:

• Metric models
• Optional extension rod allows for measuring deep holes
• Optional setting rings for zero point adjustment are available
• The anvils and cone are made from an alloy tool steel with a hardness of HRC60.5 or more.
• Design allows for measurements closer to the bottom of blind bore holes
• Scale on thimble and sleeve is laser etched for easier reading in all conditions
• Supplied in a wooden case