Industrys Best Accuracy: Light reception at the center of the line ±0.02 inch (0.5 mm) / ± 0.04 inch (1 mm) / ± 0.04 inch (0.5 mm) / ± 0.04 inch (1 mm). Repair, inspect, and adjust surveying machines, laser marking instruments: We have been responsible for repairing and calibrating the total station theodrite, auto level, laser markers, etc. [Safe Support System] ●