Topcon AT-B2 auto level

Model

AT-B4

AT-B3

AT-B2

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.