... 4. Anti-proof design ATEX diffusion type h2s gas detector for toxic gasThis Toxic gas detector with LED display and Remote control is our ... best detector. It can work alone,and also can network with gas ... diffusion Detection Gas Combustible gas, VOC (Certain Organic Vapors),H2(ppm),CO,H2S,O2(VOL),NH3(ppm), Cl2,NO, CO2 Working condition ...