Shenzhen GND Technology CO., Ltd. is a Hi-Tech company specialized in designing, researching & developing, marketing and servicing of security alarming instrument detecting for the combustible, explosive and toxic gases. Our company has developed and manufactured the instruments development of GN9000 Gas Controller,GN8010 No display Gas Transmitter,GN8020 Display Gas Transmitter,GN8080 Portable Gas Detector etc. All four series more than 50 models have passed the test by CHINA NATIONAL MINISTRY OF PUBLIC SECURITY ELIGIBITY ASSESS CENTER FOR SECURITY & PROTECTION PRODUCTS, have been and awarded with the《CERTIFICATE OF PRODUCT TYPE APPROVAL》from the Ministry of Public Security; The GN8010,GN8020, GN8080 etc. products still passed the test by the CHINA NATIONAL QUALITY SUPERVISION AND TEST CENTER FOR EXPLOSION PROTECTED ELECTRICAL PRODUCTS, and have been awarded with the《ELECTRICAL APPARATUS FOR EXPL OSIVE ATMOSPHERES-CERTIFICATE OF CONFORMITY》from the center.