Beijing Municipal Institute of Labor Protection possesses a professional acoustic building of nearly 1,000 square meters, including semianechoic room, reverberation room, sound insulation room, vibration lab, silencer lab, and equipped with leading imported measuring equipment from Denmark, Germany, and Japan, which is able of forming different measuring systems to analyze sound and vibration. With the approval of the State Environmental Protection Administration of China, it built the “Quality Center of Inspection and Supervision for Noise and Vibration Control Equipment” in 1993, undertaking quality inspection & supervision of ten categories of noise and vibration control equipment and quality certification.