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.Markus Klotz GmbH: particle counters based on Laser Diffractie Spectrometrie (LDS) sensorsContamination 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 ratioCellkraft: precision equipment for humidification and evaporation for laboratories and industrial applications.