Topcon AT-B4 24X Auto Level - 60909

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

Topcon AT-B4 24X Auto Level - 60909

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

AUTO LEVEL AT-B Series

Three Finest Models Satisfy ALL Levels of Requirements

AT-B2

High-precision model

AT-B3

Versatile model for surveying, engineering and construction

AT-B4

Economical model for engineering and construction

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 even in the harshest environmental conditions. 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.

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

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.

2-Speed focus (AT B2)

Rotation speed of the focusing knob is automatically switched between coarse and fine, allowing for quick and precise focusing.

Clampless, andless, fine Horizontal adjustments

Fine horizontal knobs located on both sides of instrument can be operated without clamping, speeding up aiming procedures to the staff and other objects.

Easy to See Circular Vial

Circular level can be viewed via integrated pentagonal prism (AT-B2) or plane mirror (AT-B3/B4) without changing your eye height.

Horizontal Circle for Angle Measurement

Horizontal angles can be directly read in 1Ÿ or 1gon units. Free rotation feature of the horizontal circle 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.

All Weather Dependability

With the IPx6 rating, the instrument is protected against powerful water jets from all directions, meaning the AT-B series withstands a sudden shower or torrential rainfall. The advanced protection design not only prevents water penetration, but also deters clouding or condensation inside the telescope.

Distance, Angle, and Height Measurement

In addition to height and angle, distance to the staff can be simultaneously measured using stadia lines. This is accomplished by reading the length of staff between two stadia lines and multiplying the value by 100.

Optional Accecssories

Diagonal Eyepiece
DE16 (AT-B2) / DE22 (AT-B3/B4)
Facilitates your works when the level is set at low height or in confined spaces.

Optical Micrometer OM5(F) (AT-B2)
Addition of the optical micrometer to the AT-B2 allows for 0.1mm (OM5) or 0.001ft. (OM5F) reading of staffs and improves accuracy to 0.5mm for 1km double run leveling. This combination is ideal for precise leveling.

40x Eyepiece EL5 (AT-B2)
Increases magnification of AT-B2 to 40x. Replaces standard eyepiece.

Specifications

		AT-B2	AT-B3	AT-B4
Telescope
Length		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"	3.5"	4"
Field of View (at 100m/328ft.)		1Ÿ20' (2.3m / 7.5ft.)	1Ÿ25' (2.5m / 8.2ft.)
Minimum Focus		0.2m (7.9 in.) from end of telescope 0.3m (1ft.) from instrument center
Image		Erect
Stadia Constant		0
Stadia Ratio		100
Accuracy (1km double run leveling)
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
Compensator
Type		Pendulum compensator with magnetic damping system
Setting Accuracy		0.3"	0.5"
Working Range		±15'
Circular level
Sensitivity		10' / 2mm
Horizontal circle
Diameter		103mm (4.1 in.)
Minimum Division		1/ 1gon
General
Water Resistance		IPX6 (IEC 60529:2001)
Operating Temperature		-20 to +50 (-4F to +122F)
Size	Width	130mm (5.12 in.)
	Length	215mm (8.46 in.)
	Height	140mm (5.51 in.)		135mm (5.31 in.)
Weight		1.85kg (4.1 lbs.)	1.7kg (3.7 lbs.)