Topcon Automatic Level AT B2:

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Topcon Automatic Level AT-B2   Utilizing a finely tuned magnetic damping system, AT-B series 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 1 o 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-B Series Features: 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 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 1 o 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.      AT-B2 AT-B3 AT-B4 Telescope 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 o 20' 1 o 25' 1 o 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 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 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 Sensitivity 10 ft./2mm 10 ft./2mm 10 ft./2mm Horizontal circle Diameter 103mm (4.1 in.) 103mm (4.1 in.) 103mm (4.1 in.) Minimum Division 1 o /1gon 1 o /1gon 1 o /1gon General Water Resistance IPX6 (IEC 60529:2001) Operating Temperature -4F to +122F (-20C to +50C) 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)   link: http://www.topconpositioning.com/sites/default/files/literature/ATB_series_Broch_7010_2057_RevA-FINAL_sm.pdf