The smallest and lightest 4-gas monitor in the world. The Riken Keiki GX-2009 weighs only 4.6 ounces, fits in the palm of your hand. It simultaneously monitors and displays combustibles, oxygen, carbon monoxide, and hydrogen sulphide. The Riken Keiki GX-2009 include dual audible alarm ports and alarm LED’s on three sides of the instrument so that alarm conditions are visible from various perspectives, particularly in high noise environments. Other features include a water-resistant and dustproof design with IP 67 rating, an impact resistant rubber over-mold body that is RFI resistant, and a large capacity data logging system included as standard.