Driesen + Kern is a leading ISO9001-certified company in the field of measurement technology for industry and research. The focus is on the calibration and sale of high-precision measuring instruments. Particle counters are available for qualification for clean rooms, as well as special solutions for filter testing with simultaneous sampling before and after a filter. The portfolio also includes probes for monitoring other air quality parameters such as temperature, relative humidity, CO2 concentration, barometric pressure, and air velocity and differential pressure sensors. Multi-protocol transmitters are available for process control, and data loggers are available for long-term monitoring.