Germany's Carl Deutsches AG was founded in 1949 and is currently managed by the third generation of leaders. The company is mainly involved in the development and manufacture of non-destructive testing (NDT) equipment. The company's main products include: portable testing equipment, fixed testing systems, probes and chemical testing reagents and equipment, etc. The Beijing office of Germany's Calder Test Equipment Co., Ltd. was established on 1995-07-20. The partnership with IQair began in 2023 to provide systematic air purification solutions for its offices to ensure the respiratory safety and health of employees in the new office.