Beijing Zhongheng'an Science and Technology Co., Ltd. looi në ruöön de 2000, ee Beijing city high-tech enterprise, specializing në industrial flammable, toxic gas detection instruments and volatile organic matter related environmental monitoring instruments R&D, production, sales and technical services work, can provide various industries for safe gas detection products, VOCs factory monitoring, fixed pollution source monitoring, portable safe environment air quality monitoring equipment, safe environment monitoring system debugging, operation and other services. Kɔmpaniy ye Beijing, factory ye Tianjin Wuqing, ku a tɛ ofis ye baai wʋsg ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai ye baai. Akutnhom acï ISO9001: 2008 Quality Management System Certification, ISO 14001 Environmental Management System Certification, ISO 18000 Workplace Health and Safety Management System Certification gam. Zhongheng'an tara R&D ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye kɛ̈l ye. A nɔŋ kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc A nɔŋ cidawu tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n-tɛ̈n