DETECTOR PUMP, Detector tube for Hydrogen Sulfide, measuring range 1ppm to 40 ppm, Detector tube for, Hydrogen Sulfide measuring range 25ppm to 1600 ppm, Detector tube for Hydrogen Sulfide measuring range, 0. 5ppm to 12 ppm, measuring range 0. 25 ppm to 120 ppm, Ethyl Mercaptan measuring range 0. 5 ppm to 120 ppm