Safety Gas Detector O2 CO H2S EX 4 in 1 Poisonous Hydrogen Monitor Waterproof 100‑240VUS Plug Item Type: Gas DetectorMaterial: ABSEasy to Carry:The gas monitor is small in size, unique clip design and convenient for users to carry.Wide Range of Uses:It can be widely used in petroleum, metallurgy, agriculture, chemical industry, oil refining, fire prevention, which can effective predict  to ensure a safe environment.Battery: 3.7V Lithium Battery 1800mA (Battery Included) Waterproof Level: IP65 Level Support Detection Gas: Combustible Gas, Oxygen, Hydrogen Sulfide, Carbon Monoxide (EX, H2S, CO, O2) Display Error: ≤5%FS Response Time: T＜30S Working Temperature: -20-50℃Conventional Gas Detection Range:Gas type          Range                      Low Alarm Point          Alarm               Resolution EX                   0-100%UEL               20%LHL                     50%LHL             1%LHL  H2S                 0-100PPM                10PPM                        35PPM               1PPM CO                   0-1000PPM              50PPM                        150PPM             1PPM O2                   0-30%VOI                 19.5%VOI                    23.5VOI            0.1%VO