Accurate Invar Spirit Level Rod
This staff adopt CH8008-92 invar belt 4J standard. The measuring scale is in 10mm. Has two images, one is erect, the other is reverse.
The principal technical specifications:
1 Coefficient of line expansion of invar belt 4J36: ≤ 2.0× 10-6/° C
2 Difference between the scale space in meter: ≤ ± 0.15mm
3 Difference between the scale space in decimeter: ≤ ± 0.1mm
4 Graduation Error: ≤ ± 0.2mm
5 Difference between basic constant and assistant constant and the null point difference of the staff: ≤ 0.05mm
6 Bubble standards: 12'/mm
7 Precision standards: ± 0.02mm+L.210-5
8 Weight: 4.9kg
9 Working temperature range: -20~+50 ° C
10 Storage temperature range: -40~+70 ° C
Product:
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