Description

Wooden invar leveling staff 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: This staff adopt CH******2 invar belt 4J*6 standard. Coefficient of line expansion: ≤1.3×***6/℃; Difference between real length and nominal length per meter: ≤±0.*2mm; Difference of average real length between the scale Spaces in meter: ≤0.*1mm; Difference between the scale space in decimeter: ≤0.**3mm; Difference between basic constant and assistant constant and the null point difference of the staff: ≤0.*2mm; Angle between the axis and the bottom plane: ≤5’; Smooth degree of the bottom plane: ≤0.*2mm; The degree of curve of the staff: ≤3mm. our staff has dual measuring scales, one is in *0mm instrument and the other is in 5mm instrument. Our leveling staff has two imagines. One is erect image and the other is inverted image. Model Length Scale distance Applicable apparatus **5A 1m, 2m, 3m 5mm **7, **2 N3 1m, 2m, 3m *0mm N3, NA2 **4 1m, 2m, 3m 5mm S1 inverted image