TOPCON AT-B4A Auto-levels

Telescope

Length: 214mm (8.42in.)

Magnification: 24X

Objective Aperture: 32mm (1.26 in.)

Resolving Power: 4”

Field of View (at 100m/328ft.): 1°25’ (2.5m / 8.2ft.)

Minimum Focus: 0.2m (7.9 in.) from end of telescope0.3m (1ft.) from instrument center

Image: Erect

Stadia Constant: 0

Stadia Ratio : 100

Focusing Knob: 1-speed

Sighting Aid: Gun Sight

Accuracy (1km double run leveling)

Without Micrometer: 2.0mm (0.08 in.)

With Micrometer: n/a

Compensator

Type: Pendulum compensator with magnetic damping system

Setting Accuracy: 0.5"

Working Range: ±15'

Circular Level

Sensitivity: 10' / 2mm

Horizontal Circle

Diameter: 99mm (3.9in.)

Minimum Division: 1°/ 1gon