1. Material: carbon steel
2. Dimensions: total length about 23 cm, ruler head width 8 cm, ruler tail width 1.6 cm, outer diameter measuring claw 4.1 cm, inner diameter measuring claw 2.3 cm
3. Weight: about 151 grams
4. Range: 150 mm
5. Surface treatment: chrome plating process
6. Resolution: 0.02mm
7. Scale process: laser scale
8. Application: outer diameter, inner diameter, depth, step measurement
9. Features: Integral chrome plating process, anti-corrosion, wear-resistant and durable, laser laser scale, clear scale, convenient for reading, tail depth measurement, metric and inch double scale, easy to use

Description:
1. Outer diameter measurement: measure the outer size and fit the two measuring surfaces to the surface to be measured
2. Inner diameter measurement: measure the size of the inner hole, the measuring claw should be measured on the diameter of the hole upwards, not skew
3. Depth measurement: To measure the depth, the depth measuring rod should be perpendicular to the bottom surface of the measured object
4. Step measurement: measure the distance of the step. The bottom measuring claw of the step ruler is parallel to the bottom end of the object to be measured, and the top measuring claw is close to the top of the object to be parallel and not skewed