1:Gas detectors with lcd 2:Imported sensor 3:ISO9001:2008 4:explosion- ... IP65Detection Gas Combustible gas, VOC (Certain Organic Vapors), H2(ppm), CO,H2S,O2(VOL),NH3 ppm),Cl2,NO,SO2 Working condition ... %RH(incondensable); pressure range:86~106kPa explosion-proof fixed gas detectors with LCD