APT b.v. is supplier of instruments for process quality monitoring and control. Representative of: SIGRIST-PHOTOMETER: process photometers. Swiss high-quality optical measuring equipment since more than 60 years. bNovate: Online autonomous flow cytometry Markus Klotz GmbH: particle counters based on Laser Diffractie Spectrometrie (LDS) sensors Contamination control in gasses, liquids and oil. Amount and size distribution of particles in gasses, liquids, oil and granulates. BS Partikles: monodisperse particle standards with an excellent price/benefit ratio Cellkraft: precision equipment for humidification and evaporation for laboratories and industrial applications.