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 a wide range of internal diameters without the need for separate instruments. This model is practical for machine shops, calibration laboratories, and repair shops.
Features:
- Measuring range: 50-500mm (Drum and extension rod combinations supplied)
- Extension rods: 13mm, 25mm, 50mm (2 pcs), 100mm, and 200mm extension rods included
- Measuring faces: hardened steel, offering good wear resistance for typical measuring applications
- Scale: 0.01mm analogue reading
- Measurement type: 2-point measurement of inside diameters for holes, bushings, tubes, and cylinders