Multigas Portable Detector With Internal Pump Co 0-2000Ppm Res 1Ppm H2S 0-200Ppm Res 1Ppm O2 0-30% Vol Res 0.1% Cl2 0-10Ppm Res 0.05Ppm Combustible 0-100% Lie Res: 1% Indication Sound And Luminic Alarm Indication