What are the characteristics of a marble square ruler

1. After long-term aging, the rock has a uniform organizational structure, linear expansion coefficient, disappearance of internal stress, and no deformation, therefore.

2. Good rigidity, strong.

3. Not afraid of acid and alkali erosion, will not rust, does not need to be oiled, is not easy to stick to dust, easy to maintain, and has a long service life.

4. No scratches, not hindered by constant temperature conditions, and able to maintain temperature measurement accuracy at room temperature.

5. Non magnetized, able to move smoothly during measurement, without any sluggishness, not affected by moisture, and the plane is properly weighed.