GB/T 10593.4-2025 "Methods of Measuring Environmental Parameters for Electric and Electronic Products - Part 4: Condensation" applies to the measurement of condensation environmental parameters at the usage sites of electric and electronic products, replacing the previous edition and introducing multiple new measurement methods. It specifies four core methods: the image measurement method, relative humidity measurement method, dew point temperature measurement method, and impedance measurement method, detailing the instrument requirements, operational key points, and condensation determination rules for each method. Considering the influence of deposited salts and surface characteristics on condensation, accompanying appendices provide relevant parameter queries and calculation methods. The standard regulates the measurement process, data processing, and result presentation, providing a unified basis for product moisture-proof design, fault risk prevention and control, and environmental assessment.