Automatic Level Topcon AT-B4

Utilizing a finely tuned magnetic damping system, AT-B automatic levels quickly level and stabilize the line of sight. These precision instruments ensure reliable leveling even when working near heavy equipment or busy highways where fine vibrations could be present. The automatic levels feature IPX6 protection against powerful water jets from all directions and are fully resistant to driving rain and splashing water.

Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature 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.

AT-B4 Features:

    •    Durable, Dependable, High Value Auto Levels
    •    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 AT-B Series 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.

Horizontal Circle for Angle Measurement

Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature 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.

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

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.
  

TELESCOPE         

• Length         215mm (8.46 in.)
• Magnification         24X
• Objective Aperture         32mm (1.26 in.)
• Resolving Power         4 in.
• Field of View         1°25’ (at 100m/328ft.)
• (at 100m/328ft.)         (2.5m/8.2 ft.)
• Min. Focus from end of telescope         0.2m (7.9 in.)
• Min. Focus from instrument center         0.3m (1 ft.)
• Image         Erect
• Stadia Constant         0
• Stadia Ratio         100
• Focusing Knob         1-speed
• Sighting Aid         Gun Sight

ACCURACY         

• Without Micrometer         2.0mm (0.08 in.)
• With Micrometer         n/a

COMPENSATOR        

• Type    Pendulum compensator with magnetic damping system    
• Setting Accuracy         0.5 in.
• Working Range         ±15 ft.

CIRCULAR LEVEL     AT-B4

• Sensitivity         10 ft./2mm

HORIZONTAL CIRCLE    

• Diameter         103mm (4.1 in.)
• Minimum Division     1°/1gon

GENERAL        

• Water Resistance    IPX6 (IEC 60529:2001)    
• Operating Temperature -4°F to +122°F (-20ºC to +50ºC)    
• Width        5.12 in. (130mm)
• Length         8.46 in. (215mm)
• Height         5.31 in. (135mm)
• Weight        3.7 lbs. (1.7kg)