... Hua Fan Instrument Co.,Ltd is one of the leading 14 portable gas alarming detector manufacturers and suppliers in China, welcome to ... leak detector, combustible gas leak detector, carbon monoxide leak detector made in China from us.Product description:Portable single gas ... oxygen (O2), toxic or harmful gases (CO, H2S, NH3, CL2, etc.)Response time:≤40s(CO)Display: segment LCD, high brightness yellow ...