B20-25 40x Auto Level w/ Horizontal Circle

B20-25 40x Auto Level w/ Horizontal Circle
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Sokkia B series automatic levels feature enhanced reliability under all environmental conditions. Tough and compact bodies are more tightly sealed against water, humidity and dust (IPx6). The B series levels provide quick setup, easy sighting, and superior durability against vibration and shock, ensuring the increased productivity over an extra-long period of time.

Precise, Reliable Automatic Compensator
The B series levels incorporate the most precise and reliable compensator available in the market today. The technological superiority of the Sokkia automatic levels has been proven since the release of the best-selling B2 model in1963. Four super-high-tensile suspension wires and magnetic damping system ensure accuracy and stability even when exposed to temperature changes,vibration or shock.

Rapid, Easy Setup

A domed-head tripod makes setting up faster and easier even on inclined, uneven grounds. The B series levels also fit flat-head tripods. The circular level can be seen on a pentaprism or plane mirror located beside the telescope eyepiece.

Quick Collimation

Two knobs of endless horizontal motion drives can be operated with either hand for fast and easy aiming.

Horizontal Angle Measurement
Horizontal angles can be read in 1° or 1gon units. Freely rotatable circle allows any angle reading from zero. Right angles can be quickly set for layout and alignment tasks. The readout window is conveniently located on the instrument base – directly below the eyepiece.

Superior Telescope
Optimally designed telescope provides exceptionally bright and sharp view that reduces operator’s eye strain. Ultra-short focus distance of 20cm (7.9in.) from end of telescope* makes it easiest to use in confined locations. Two-speed focus knob switches between coarse and fine for even faster operation (B20).*30cm (1ft.) from instrument



  • Incorporates the most Precise and Reliable Automatic Compensator available in the market
  • Superior Telescope provides exceptionally bright and sharp view that reduces operator's eye strain
  • Quick Collimation for fast and easy aim


Length 215 mm (8.46 in.)
Magnification 40x
Objective Aperture 42mm (1.65in.)
Resolving Power 3"
Field of View (at 100m/328 ft.) 1°20'(2.3m / 7.5ft.)
Minimum focus 0.2m (7.9in.) from end of telescope 0.3m (1ft.) from instrument center
Image Erect
Reticle Pattern Wedge
Stadia Constant 0
Stadia ratio 100
Focusing knob 2-speed
Sighting aid Peep Sight
Retractable Retractable
Accuracy (standard deviation for 1km double run leveling)
Without micrometer 0.7 mm (0.03 in.)
With Micrometer 0.5 mm (0.2 in.)
Type Pendulum compensator with magnetic damping system
Setting Accuracy 0.3"
Working range ±15'
Circular level
Sensitivity 10' / 2mm
Mirror Pentaprism
Horizontal Circle
Diameter 103mm (4.1 in.)
Graduations 1degree/ 1 gon
Horizontal motion drive Clampless, endless, double-sided knobs
Water resistance IPX6 (IEC 60529:2001)
Operating temperature -20 to + 50 degree C (-4 to +122 degree F)
Size: Width x Length x Height 130mm (5.12in.) x 215mm (8.46in.) x 140mm (5.51in.
Weight 1.85kg (4.1 lb.)

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