This standard specifies the classification, technical requirements, test methods and inspection rules of phase and pulsed photoelectric range finders. The standard applies to the design, production, testing and inspection of photoelectric range finders, including the ranging part of the total station and the handheld Laser rangefinder. The content covers the Encasement, marking, transportation and storage requirements of the instrument. The standard provides the definition of the terms of the photoelectric range finder, clarifying the basic specifications and error types of various ranging instruments including photoelectric technology, handheld Laser rangefinder and total station, ensuring the accuracy and Reliability of the ranging instrument in different applications.