Testo SE & Co. KGaA is a measurement technology company headquartered in Lenzkirch in the Black Forest, Germany, that develops, produces and markets portable and stationary measuring instruments and measurement data management solutions. Its range covers temperature, humidity, pressure, flow, emission, CO2/CO, light, sound, electrical measurement, thermal imagers, dataloggers and monitoring, pH and cooking oil testers, smart probes and transmitters. It also offers the testo Saveris monitoring and compliance systems for food safety and regulated GxP environments. Founded in 1957, it has about 3,200-3,500 employees and 34-37 subsidiaries worldwide.