B20 B30A B40A Auto Level


B20 B30A B40A Auto Level

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 B20/B30A/B40A 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.
20cm (7.9 in.) - Ultra-Short Minimum Focus
B20/B30A/B40A can focus on objects at 20cm (7.9 in.) in front of the telescope. This feature dramatically facilitates the works in confined spaces.
Horizontal Circle for Angle Measurement
Horizontal angles can be directly read in 1° or 1gon units. Free rotation feature allows you to read any angle from zero.
All-Weather Dependability
With the IPX6 rating, the instrument is protected against powerful water jets from all directions, meaning B20/ B30A/B40A withstands a sudden shower or torrential rainfall.

The advanced protection design also deters clouding or condensation inside the telescope.
  B20 B30A B40A
Length 215mm (8.46in.) 214mm (8.42in.)
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.)
1°20' (2.3m / 7.5ft.) 1°25’ (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
Focusing Knob 2-speed 1-speed
Sighting Aid Peep Sight Gun Sight
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
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 (4.1in.) 99mm (3.9in.)
Minimum Division 1°/ 1gon
Water Resistance IPX6 (IEC 60529:2001)
Operating Temperature -20 to +50ºC (-4 to +122°F)

Width 130mm (5.12in.) 122mm (4.8in.)
Length 215mm (8.46in.) 214mm (8.4in.)
Height 140mm (5.51in.)
Weight 1.85kg (4.1lbs.) 1.5kg (3.3lbs.)
Standard Package/ Optional Accessories
  • Main unit
  • Hex wrench
  • Adjusting pins
  • Vinyl cover (B20/B30A)
  • Plumb bob (B20/B30A)
  • Cleaning cloth
  • Lens cap
  • User manual
  • Hard carrying case
Diagonal Eyepiece DE16 (B20)
Optical Micrometer OM5 (B20)
40x Eyepiece EL5 (B20)
Ultimate Environmental Performance and Durability

SOKKIA has been performing environmental tests against a set of expected job site conditions to certify the products for the long term use. The B Series has been tested by the special inspection equipment for complete waterproofness. The B Series also has the highest environmental performance and durability in SOKKIA’s Auto Level history, proven by tests against temperature, humidity, vibration and drop.
Water Proof Test (IPX6)
The B Series is proven to withstand powerful water jets from all directions without any submergence inside the unit
Cold and Heat Resistance Test
The B Series has passed operating temperature tests from – 20 ºC to + 50 ºC degree.
Durability Test
The B Series has passed strict durability tests including rotation of leveling foot screw, Focusing knob and Horizontal fine motor screw.

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