... size , light weight, rugged ABS+PC case 2.Changeable different gas sensors for this equipment. 3.Welcome OEM OEMBesides our own gas ... , petrochemical, metallurgical, chemical, municipal gas, and other places at the scene ... gas detectors, welcome you contact with me. we are very glad to customize the product you want according to your requirement. Pocket-size h2s/hydrothion gas detector analyzer/monitor ...