Topcon AT-B3A Automatic Level

The Topcon AT-B3A is a versatile automatic optical level designed for a broad range of surveying, civil engineering and construction applications. It offers a practical balance of optical performance, portability and durability for crews carrying out routine elevation and leveling work.

Unlike the precision-oriented AT-B2, the AT-B3A is designed as a general-purpose model for everyday field surveying and construction.

Key Features

• 28× telescope for general field observation

• 1.5mm standard deviation for 1km double-run leveling

• Compact and lightweight design

• Magnetic-damping automatic compensator

• Short 20cm focusing distance

• Clampless endless horizontal fine adjustment

• IPX6 protection for outdoor environments

• Designed for surveying, civil engineering and construction

Versatile Level for Everyday Field Work

The AT-B3A is a good fit for projects where the instrument is frequently moved between different setups. Its compact body and moderate telescope magnification make it practical for construction sites, road projects and general engineering surveys.

Topcon's automatic compensator is designed to settle quickly and maintain a stable line of sight even when working near heavy equipment or busy roads. This makes the AT-B3A especially useful for active construction environments.

Core Specifications

• Model: AT-B3A

• Magnification: 28×

• Objective aperture: 36mm

• Standard deviation of 1km double-run leveling: 1.5mm

• Minimum focus: 0.2m from telescope end

• Compensator setting accuracy: 3.5″

• Protection: IPX6

• Operating temperature: -20°C to +50°C

• Weight: approximately 1.5kg

Applications

• Construction surveying

• Civil engineering

• Road and infrastructure projects

• Site leveling

• Elevation transfer

• General land surveying

• Engineering measurement