A dew point meter is used in compressed air systems to ensure the air quality which is used in the production and throughout all the processes in a factory. Not only protecting equipment and keeping the air quality at a certain level, but also for air quality audits according to ISO 8573-1 and ISO 8573-3 a dew point meter is absolutely necessary. A dew point meter typically outputs the pressure dew point of the compressed air, besides that humidity and temperature are measured as well.