The indium steel coding ruler body is made of 6065 high-strength aluminum alloy. Its appearance design ensures that it is not prone to deformation during use and is also convenient for the measurer to carry and use. The ruler tape is made of indium steel, and the specification of indium steel is 0.7x25mm. The thermal expansion coefficient of indium steel is
( the national standard is
) , the coefficient of expansion is small, and there is a tension of 3 kilograms at the top of the tape . It is minimally affected by the external environment during use. The differentiated surface is high-temperature baking paint to ensure that it is wear-resistant, non-fading and durable. It uses high-energy laser beams. The upper paint layer is vaporized, and the bottom paint is exposed to form stripes, which can be used for national first- and second-class level measurement. Currently, there are 2m and 3m indium steel rulers, which can also be customized according to user needs.
The specific technical parameters of the indium steel code ruler are shown in the following table:
serial number | project | unit | Technical parameters |
1 | Correct installation of circular level on barcode ruler |
| When the barcode ruler is vertical, the horizontal bubble is centered |
2 | Curvature of barcode sizing plane | mm |  4
|
3 | Perpendicularity between the central axis of the ruler and the bottom surface of the barcode ruler | mm |  0.05
|
4 | Barcode length correction number | mm |  0.05
|
5 | Ruler marking standard deviation |  m
|  13
High precision standard deviation 2 |
6 | Barcode ruler zero spread | mm |  0.005
|
7 | Zero point difference between a pair of barcode rulers | mm |  0.01
|