Topcon AT-B4 24x Auto Level w/HZ Circle

Product Description

Utilizing a finely tuned magnetic damping system, AT-B series automatic levels quickly level and stabilize the line of sight. These precision instruments ensure reliable leveling even when working near heavy equipment or busy highways where fine vibrations could be present. The automatic levels feature IPX6 protection against powerful water jets from all directions and are fully resistant to driving rain and splashing water.

Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature allows you to read any angle from zero. The circle is covered for protection against dirt and scratch. The readout window is located below the eyepiece for quick reading.

AT-B Series Features:

  •  Durable, Dependable, High Value Auto Levels
         •    3 Models - 32x, 28x, and 24x Magnifications
         •    Rapid, Accurate, and Stable Automatic Compensation
         •    Ultra-Short 20cm (7.9 in.) Focusing
         •    All-Weather Dependability
         •    Clampless, Endless Fine Horizontal Adjustments

Rapid, Stable, and Durable Compensator

The compensator of AT-B Series incorporates four suspension wires made of super-high-tensile metal that features minimal thermal expansion coefficient, providing unmatched durability and accuracy. Finely tuned magnetic damping system quickly levels and stabilizes the line of sight despite the fine vibrations present when working near heavy equipment or busy roadways.

Horizontal Circle for Angle Measurement

Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature allows you to read any angle from zero. The circle is covered for protection against dirt and scratch. The readout window is located below the eyepiece for quick reading.

20cm (7.9 in.) - Ultra-Short Minimum Focus

The AT-B Series can focus on objects at 20cm (7.9 in.) in front of the telescope. This feature dramatically facilitates the works in confined spaces.

TELESCOPE

AT-B2

AT-B3

AT-B4

Length

215mm (8.46 in.)

215mm (8.46 in.)

215mm (8.46 in.)

Magnification

32X

28X

24X

Objective Aperture

42mm (1.65 in.)

36mm (1.42 in.)

32mm (1.26 in.)

Resolving Power

3 in.

3.5 in.

4 in.

Field of View

1°20’

1°25’

1°25’ (at 100m/328ft.)

(at 100m/328ft.)

(2.3m/7.5 ft.)

(2.5m/8.2 ft.)

(2.5m/8.2 ft.)

Min. Focus from end of telescope

0.2m (7.9 in.)

0.2m (7.9 in.)

0.2m (7.9 in.)

Min. Focus from instrument center

0.3m (1 ft.)

0.3m (1 ft.)

0.3m (1 ft.)

Image

Erect

Erect

Erect

Stadia Constant

0

0

0

Stadia Ratio

100

100

100

Focusing Knob

2-speed

1-speed

1-speed

Sighting Aid

Peep Sight

Gun Sight

Gun Sight

ACCURACY

AT-B2

AT-B3

AT-B4

Without Micrometer

0.7mm (0.03 in.)

1.5mm (0.06 in.)

2.0mm (0.08 in.)

With Micrometer

0.5mm (0.02 in.)

n/a

n/a

COMPENSATOR

AT-B2

AT-B3

AT-B4

Type

Pendulum compensator with magnetic damping system

Setting Accuracy

0.3 in.

0.5 in.

0.5 in.

Working Range

±15 ft.

±15ft.

±15 ft.

CIRCULAR LEVEL

AT-B2

AT-B3

AT-B4

Sensitivity

10 ft./2mm

10 ft./2mm

10 ft./2mm

HORIZONTAL CIRCLE

AT-B2

AT-B3

AT-B4

Diameter

103mm (4.1 in.)

103mm (4.1 in.)

103mm (4.1 in.)

Minimum Division

1°/1gon

1°/1gon

1°/1gon

GENERAL

AT-B2

AT-B3

AT-B4

Water Resistance

IPX6 (IEC 60529:2001)

Operating Temperature

-4°F to +122°F (-20ºC to +50ºC)

Width

5.12 in. (130mm)

5.12 in. (130mm)

5.12 in. (130mm)

Length

8.46 in. (215mm)

8.46 in. (215mm)

8.46 in. (215mm)

Height

5.51 in. (140mm)

5.51 in. (140mm)

5.31 in. (135mm)

Weight

4.1 lbs. (1.85kg)

3.7 lbs. (1.7kg)

3.7 lbs. (1.7kg)