Tubular Inside Micrometer, Hardened Face

The 137 series models provide an accurate and flexible solution for measuring inside diameters when the available measuring range varies. The extension rod measuring system allows the same micrometer for various internal measurements without the need for separate instruments. The model is practical for machine shops, measuring laboratories, and workshops.
Features:
- Measuring range: 2-12" (Drum and included extension rod combinations)
- Extension rods: 5 extension rods included in the package
- Measuring faces: hardened steel, offering good wear resistance for common measuring applications
- Scale: 0.001" analogue reading
- Measurement type: 2-point inside diameter measurement for holes, bushings, tubes, and cylinders