Tubular Inside Micrometer, Hardened Face

The 137 series models provide an accurate and flexible solution for measuring inside diameters when the measurement range varies. The extension rod-based measuring system allows the same micrometer to be used for various internal diameters without the need for separate instruments. This model is practical for machine shops, measuring laboratories, and workshops.

Features:
- Measuring range: 2-20" (Drum and extension rod combinations supplied)
- Extension rods: 6 pcs extension rods included in the package
- Measuring surfaces: hardened steel, offering good wear resistance for typical measuring applications
- Scale: 0.001" analogue reading
- Measurement type: 2-point inside diameter measurement for holes, bushings, tubes, and cylinders.