GB 12526-1990

This standard specifies the technical requirements and testing methods for long-range electro-optical distance measurement instruments, covering accuracy classes, environmental adaptation, and calibration procedures. It is primarily applied in geodetic surveying, large-scale engineering construction, and national land mapping projects where precise long-distance measurements (typically over several kilometers) are required. The standard ensures reliability and consistency in field operations for tasks such as baseline establishment, deformation monitoring, and topographic surveys.