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 to be suitable 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: 50-150mm (Drum and extension rod combinations supplied)
- Extension rods: 13mm, 25mm, and 50mm extension rods included
- Measuring surfaces: hardened steel, offering good wear resistance for typical measuring applications
- Scale: 0.01mm analogue reading
- Measurement type: 2-point inside diameter measurement for holes, bushings, tubes, and cylinders.