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Testo SE & Co. KGaA is a company from Lenzkirch, founded in 1957, with its headquarters in Titisee-Neustadt. The company has 35 subsidiary firms in China, Japan, Korea, USA, France, Spain, Italy, and other countries and employs around 3200 people. 1700 alone at its sites in Lenzkirch, Kirchzarten, and Titisee.