Specification :

The market- and time-proven " B" series automatic levels provide outstanding precision for all kind of leveling tasks.
All models incorporate SOKKIA original compensators with a magnetic damping system for the highest dependability.
B20 and B21 are IPX4 water resistent.

B1C B1 B20 B21 High Precision Automatic Levels
Model B1C B1 B20 B21
Telescope magnification 32x 30x
Objective aperture 45mm ( 1.8in.) 42mm ( 1.7in.)
Minimum focus 2.3m ( 7.5ft.) 0.3m ( 1.0ft.)
Accuracy
( Standard deviation for 1km double-run leveling) Without micrometer 0.8mm ( 0.03in.) 0.7mm ( 0.027in.) 1.5mm ( 0.06in.)
With micrometer 0.5mm ( 0.02in.) 0.5mm ( 0.02in.) 1.2mm ( 0.05in.)
Compensator Type 4 wire pendulum compensator with magnetic damping system
Working range ± 10' ± 15'
Water protection  IPX4 ( IEC 60529)
Horizontal circle graduation 1° ( 1gon)  1° ( 1gon)
Weight 3.2kg ( 7.1lb.) 3.0kg ( 6.6lb.) 1.85kg ( 4.1lb