Beijing Hangxuan Technology Development Co., Ltd. is a high-tech company that relies on aerospace technology and integrates industry and trade. It is a subsidiary of Japan's Guangming Physical and Chemical (Beichuan) KRK、 The general agent of Baite. At the same time, various sensors are also developed and produced, and their products are widely used in various military and civilian projects. Japan Bright Chemical Co., Ltd. (Kitagawa) is a well-known gas detection professional manufacturer in Japan. Its products can detect up to 300 types of gases, including various toxic, harmful, flammable and explosive gases. Gas detection tubes, emergency gas detection, toxic and harmful gas detection, emergency gas detection boxes, water quality detection and other services are widely used for gas detection in various industrial and civil living environments. Such as metallurgy, petrochemicals, mining, indoor air quality testing, etc. KRK is a well-known manufacturer of water quality testing instruments in Japan, and its products are widely used in fields such as drinking water, sewage, pure water, surface water, and groundwater.