Main Unit for Tubular Inside Micrometer

Mitutoyo 137-012 - Drum for Internal Micrometer

The Mitutoyo 137-012 is a drum for the internal micrometer and serves as the core of the measuring instrument. Various extension rods can be attached to the drum to significantly extend the measuring range. This enables the micrometer to measure various internal diameters. These main units are used in combination with Mitutoyo's 137 series extension rods.

Features

- Measuring range (Drum): 2-2.5"
- Resolution: 0.0004" (analog scale)
- Compatible with extension rods to significantly extend the total measuring range
- Hardened measuring tip for general measurements

The design allows for accurate measurement of inside diameters for holes, bushings, cylinders, and tubes.