The Topcon AT‑B4A is an automatic level designed for construction and survey applications, offering 24× magnification, short minimum focus distance, and IP66 protection for durability in tough field conditions. It’s part of Topcon’s AT‑B series, known for stability and precision in leveling tasks.
| Feature |
Details |
| Magnification |
24× |
| Objective Aperture |
32 mm |
| Resolving Power |
4″ |
| Field of View |
1°25′ (2.5 m at 100 m) |
| Minimum Focus Distance |
0.2 m (from instrument center) |
| Stadia Ratio |
100 |
| Accuracy (per 1 km double run) |
±2.0 mm |
| Compensator |
Magnetic damped, ±15′ working range |
| Horizontal Circle |
360° (graduated in 1° increments) |
| Water/Dust Protection |
IP66 |
| Dimensions |
215×135×145 mm |
| Weight |
~1.5 kg |
