GB/T 29024.2-2016 "Particle Size Analysis - Single Particle Light Interaction Methods - Part 2: Light Scattering Liquid-borne Particle Counter" specifies the technical requirements for measuring solid particles in liquids using the light scattering method with liquid-borne particle counters. It includes the measurement principles, instrument performance indicators, sample handling procedures, measurement operation steps, and data processing methods. This standard is applicable to the determination of the size and number concentration of individual particles in liquid media such as hydraulic oil and lubricating oil using the principle of light scattering. It provides a unified methodological basis for the quantitative analysis of particulate contamination in liquid systems, ensuring the accuracy and comparability of measurement results.