Sokkia’s B series automatic levels feature enhanced reliability under all environmental conditions and are more tightly sealed against water, dust and humidity (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.

The B series Sokkia Auto levels incorporate the most precise and reliable compensator available in the market today. The optimally designed telescope provides exceptionally bright and sharp view that reduces operator’s eye strain. Quick-collimation and horizontal angle measurement combine for fast and easy aiming of layout and alignment tasks.

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Sokkia B20, B30 & B40 Auto level Features:-

  • Leveling Accuracy: B20 – ±0.7mm; B30 ±1.5mm; B40 ±2.0mm
  • Telescope Magnification: B20 – 32x; B30 – 28x; B40 – 24x
  • Minimum focus distance: 0.2m from end of telescope, 0.3m from instrument center
  • IPX6 (IEC 60529:2001) dust tight and water tight protection
  • Precise, Reliable Automatic Compensator
  • Horizontal Angle Measurement
  • Quick collimation with two horizontal motion knobs
  • Superior telescope with two-speed focus knob

Key Features of Sokkia B20/ B30/ B40 Auto Level

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 in 1963. Four super-high-tensile suspension wires and magnetic damping system ensure accuracy and stability even when exposed to temperature changes, vibrations, or shock.

Superior Telescope
Optimally designed telescope provides exceptionally bjustify 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.

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

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.

The stadia lines on the reticle allow distance measurements. Simply multiply the staff length between the top and bottom stadia lines by 100.

Easy to Adjust
Reticle adjustment is made with one screw. Circular levels vial is adjusted with two screws. Both adjustments are simple and fast with provided tools.

Standard Equipment
B Series Automatic Level Instrument, Lens Cap, Plumb Bob, Vinyl Rain Cover, Cleaning Cloth, Tool Kit, Operator’s Manual, Hard Carrying Case.

OM5/OM5F Parallel Plate Micrometer (Optional for Sokkia B20 Level)
To achieve the highest precision with the top-of-theline B20 model, the optional parallel plate micrometer OM5 allows for staff readings in increments of 0.1mm (estimation to 0.01mm). Accuracy for 1km double run leveling can be increased from 0.7mm to 0.5mm. Imperial version OM5F has 0.001ft. graduations.

Specifications of Sokkia B20 / B30/ B40 Automatic Level

TELESCOPE Sokkia B20 Level Sokkia B30 Level Sokkia B40 Level
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 Sokkia B20 Sokkia B30 Sokkia B40
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 Sokkia B20 Sokkia B30 Sokkia B40
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 Sokkia B20 Sokkia B30 Sokkia B40
Sensitivity 10 ft./2mm 10 ft./2mm 10 ft./2mm
HORIZONTAL CIRCLE Sokkia B20 Sokkia B30 Sokkia B40
Diameter 103mm (4.1 in.) 103mm (4.1 in.) 103mm (4.1 in.)
Minimum Division 1°/1gon 1°/1gon 1°/1gon
GENERAL Sokkia B20 Sokkia B30 Sokkia B40
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)
  • Carrying Case
  • Lens cap
  • Tool kit
  • Plumb Bob
  • Vinyl cover
  • Cleaning cloth
  • Telescopic Aluminium Tripod
  • Levelling Staff
  • User manual