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 arm measuring system allows the same micrometer for a wide range of internal diameters without the need for separate instruments. The model is practical for machine shops, measuring laboratories, and workshops.
Features:
- Measuring range: 50-1000 mm (Drum and extension arm combinations supplied)
- Extension arms: 13 mm, 25 mm, 50 mm (2 pcs), 100 mm, 200 mm (2 pcs), and 300 mm extension arms included in the package
- Measuring surfaces: hardened steel, offering good wear resistance for most common measurement applications.
- Scale: 0.01 mm analogue reading
- Measurement type: 2-point inside diameter measurement for holes, bushings, tubes, and cylinders