On April 29, 2025, the CEC Cleaning Excellence Center invites interested parties to Heimsheim for an expert discussion under the motto "How clean is production really?". Whether gray room, clean room or certified clean room - controlled production environments are a decisive success factor in modern production. Only the right measurement technology makes invisible contaminants visible. At the CEC interest group at PMT Partikel Messtechnik GmbH in Heimsheim, participants will have the opportunity to experience the entire range of measurement technologies for particle detection. Keynote speeches will provide practical and compact expert knowledge on clean and cleanroom concepts. Various measuring systems can be tested in direct comparison in live demonstrations. It is also possible to take measurements yourself in so-called "hands-on sessions", from coarse particles to the finest contaminants. The topic of ESD, electrostatic discharge as an often underestimated factor in production, will also be covered. The event is aimed at interested parties from production management and quality assurance as well as anyone who wants to optimize clean production in a targeted manner. Participation is free of charge, but places are limited. CEC members have priority.