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Interscan's portable gas analyzers are available for Br2, CO, Cl2, ClO2, C2H4, ethylene oxide, HCHO, H2, hydrazine, HBr, HCl, HCN, H2O2, H2S, NO, NO2, O3, propylene oxide, and SO2. Features: An integral sample pump, powered by rechageable Ni-Cd batteries (supplied), giving up to 10 hours of continuous service Digital readout of concentration in real time Audible and visual alarm N ...