DS/ISO 8573-3 standard is a test method for Humidity measurement of compressed air. Humidity is an important parameter of compressed air mass. Excessive moisture may cause equipment corrosion, failure or affect product mass. The standard provides effective Humidity Measuring methods for various compressed air application scenarios to ensure that the mass of compressed air meets industrial requirements. Several techniques for Measuring humidity are detailed in the standard, including condensation method, Conductivity detector method and drying agent method, etc., which are suitable for measurement of different Humidity ranges. By following this standard, users can accurately monitor the Moisture content in the compressed air, and then choose the appropriate drying or treatment method to ensure the Reliability of the system and product mass. This standard has a wide range of applications in many industrial fields, such as electronics manufacturing, Food processing, pharmaceuticals, etc.