1. CH4, CO, O2, H2S gas detector 2, provide OEM, ODM 3. a full set of service from design, mold making to software and pcb . This multi gas detecting device is customized for one of our customer, they can do the electronics by themselves, we design and produce its plastic enclosure for them. and then to assemble a complete finished gas detectors. We offer off shell plastic case for electronic and ...