Sokkia B20 auto level

Model

B40

B30

B20

Telescope

Length

215mm(8.46 inch)

Objective aperture

32mm

36mm

42mm

Magnification

24X

28X

32X

Image

Erect

Resolving power

4"

3.5"

3.0"

Field of view(at 100m)

1° 25′ (2.5m)

1° 20′ (2.3m)

Minimum focussing distance

0.2m (7.9in.) from end of telescope
0.3m (1ft.) from instrument cener.

Reticle pattern

Cross hairs

wedge

Stadia ratio

100

Stadia constant

0

sighting aid

Gun sight

Peep sight

Focusing Knob

1-speed

2-speed

Lense hood

-

Retractable

Accuracy(standard deviation for 1km double   run leveling)

Without micrometer

2.0mm
(0.08in.)

1.5mm
(0.06in.)

0.7mm
(0.03in.)

With micrometer

0.5mm
(0.02in.)

Compensator

Type

pendulum compensator with magnetic damping   system

Working range

± 15′

Setting accuracy

0.5"

0.3"

Horizontal Circle

Diameter

103mm (4.1in.)

Graduation

1°/1gon

General

Sensitivity of circular level

10′/2mm

Mirror for circular level

Plane mirror

pentaprism

Horizontal motion drive

Clampless, endless, double-sided knobs

Water resistance

IPX6(IEC60529)

Operating temperature

-20-+50°C (-4 to +122°F)

Size

122mm× 215mm× 135mm

130mm× 215mm× 140mm

Weight

1.7kg (3.7 lb.)

1.85kg (4.1 lb.