Brand Introduction：Testo AG is one of the world's leaders in the portable measuring instrument industry. It is headquartered in the Black Forest in southern Germany. It was founded in 1957, with a history over five decades. TESTO has operations all over the world, with subsidiaries and agencies in 27 countries and regions, and more than 1700 employees worldwide. TESTO is a leading brand of portable industrial instrumentation, a global leader in food-grade thermometers and one of the leading brands of portable flue gas analyzers. However, in recent years, it has also actively expanded its product line. In addition to portable industrial testing instruments, it has successively launched online temperature transmitters, humidity transmitters and pressure dew point transmitters. In 2010, it creatively launched the Saveris wireless temperature and humidity recording and monitoring system.