Topcon AT-B Series Dumpy Levels

The compensator of AT-B Series incorporates four suspension wires made of super-high-tensile metal, which features minimal thermal expansion coefficient – providing unmatched durability and accuracy.

Horizontal circle for measurement

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

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Durable, dependable, high value Topcon Dumpy levels.

Topcon have two new, updated auto levels to replace the AT-B3 and AT-B4!  The levels have been updated to feature a smaller, lightweight design while still improving the performance of the unit.

New Features:

Completely NEW design, same compensator from AT-B2 series, lightweight at 1.5 kg m(3.3lb) A 13% reduction from previous version, easy to grasp (compact body), better visibility of horizontal circle, improved tangents/knobs, increased gear ratio for shock and vibration.

The Topcon AT-B Series Dumpy Levels are available in 3 Models – 24x, 28x, and 32x Magnification.

The AT-B Series of precision instruments utilise a finely tuned magnetic dampening system to provide unmatched durability and accuracy.  Essential reliability when working near heavy equipment or busy highways, or where fine vibrations may be present.

Suitable for: Site preparation, earthworks, concreting, drainage and site set-out

Features: Kit Includes:
  • Choice of 3 models: AT-B2 (32x magnification), AT-B3 (28x magnification) and AT-B4 (24x magnification)
  • Rapid, accurate and stable automatic compensation
  • Ultra-short 20cm focussing
  • All-weather dependable
  • Clampless, endless fine horizontal adjustments
  • AT-B level
  • Plumb bob
  • Hex wrench
  • Adjusting pins (AT-B2 only)
  • Vinyl cover
  • Cleaning cloth & lens cap
  • Hard case
  • User manual


Length 215 mm 214 mm 214 mm
Magnification 32 x 28 x 24 x
Objective Aperture 42 mm 36 mm 32 mm
Resolving power 3 in. 3.5 in. 4 in.
Field of view
(at 100 m)
2.3 m
2.5 m
2.5 m
Focussing Knob 2-speed 1-speed  1-speed
Sighting aid Peep sight Gun sight  Gun sight
(w/out micrometre)
0.7 mm 1.5 mm
(w/ micrometre)
0.5 mm n/a  n/a
Circular level sensitivity 2 mm 2 mm 2 mm
 Horizontal Circle diameter 103 mm 103 mm 103 mm


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