Specification :

Sokkia B-20

Image
Erect
Magnification
32x or 40x ( opt.)
Resolving Power
n/ a
Field of View
1° 20’ ( 2.3 ft. @ 100 ft.)
Minimum Focus
1 ft. ( 0.3m)
Stadia Ratio
1: 100
Compensator — PL1 ( split-image tubular vial) ; all others ( wire-hung; magnetically damped)
Setting Accuracy
0.3"
Range
± 15'
Leveling Accuracy ( all models) — in 1.0 km ( 1 mile) of double-run leveling
Standard Deviation
± 1.0mm / .004 ft.
w/ micrometer
± 0.8mm / .003 ft.
Level Vial ( all models) — circular
Sensitivity
10' / 2mm