Wooden staff body:
Choosing the first-grade superior quality red pine, the staff is processed with the modern arts and crafts technologies, such as decomposing, degreasing, aging, compounding, molding, etc.
Having less distortion, lighter weigh, the staff applies to the first, second grade land surveying.

The principal technical specifications:
Coefficient of line expansion: ≤ 1.3× 10-6/degree
Difference between real length and nominal length per meter: ≤ ± 0.02mm
Difference of average real length between the scale space in meter: ≤ 0.01mm
Difference between the scale space in decimeter: ≤ 0.013mm
Difference between basic constant and assistant constant and the null point difference of the staff: ≤ 0.02mm
Angle between the axis and the bottom plane: ≤ 5'
Smooth degree of the bottom plane: ≤ 0.02mm
The degree of curve of the staff: ≤ 3mm

This staff adopt CH8008-92 invar belt 4J standard. And our staff has dual measuring scales, one is in 10mm instrument and the other is in 5mm instrument. Our leveling staff has two imagines.


Precision standards: ± 0.02mm+L*2*10-5
Weight: 4.9kg
Working temperature range: -20~+50 degree
Storage temperature range: -40~+70 degree
Bubble standards: 12'/m