Testo SE & Co. KGaA is the world's leading manufacturer of electronic handheld measuring devices. Still headquartered in Lenzkirch, in the heart of Germany's Schwartzwald, Testo's first product was the Testostor, a thermometer for clinical laboratory work. The company's founding goes along with the launch of said product in 1957. Worldwide, more than 2,500 people work daily in research, product development, production and marketing with the goal of developing innovative measuring instruments for Testo's customers. Testo measuring devices serve professionals in a wide range of sectors from industrial and energy emission measurement, to self-monitoring in the food industry, and the field of air conditioning and construction technology.