SPR-728 portable Sulfur dioxide gas detector is widely used in the area where explosion-proof is required or toxic gas leaks, like petroleum, chemical , environmental protection , metallurgy, refining , gas transmission and distribution , production chemical medicine agriculture and other industries, so as to protect the workers’ life and avoid damage on the relevant equipment. The shell is made of high-strength engineering plastics and composite anti-skid rubber. Waterproof, dust-proof, and explosion-proof.