SPR-701 portable multi-gas detector could detect combustible gas, O2 and other two types toxic gases continuously and simultaneously. It is widely used in the area where explosion-proof is required or toxic gas leaks, like underground channels or mining industry, 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.