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 measuring system based on extension rods allows the same micrometer to be suitable for various internal measurements without the need for separate instruments. The model is practical for machine shops, measuring laboratories, and workshops.

Features:
- Measuring range: 2-6" (Drum and extension rod combinations supplied)
- Extension rods: 3 extension rods included in the package
- Measuring surfaces: made of 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