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The Riken Keiki GW-3 portable gas detector is a portable gas monitor for personal use designed to detect gases in the surrounding atmosphere. It measures concentrations of toxic gases and oxygen in the atmosphere and issues an alarm when gas concentrations reach preset levels, thereby alerting users to the hazards of gas poisoning and oxygen deficiency. The detection results are not intended to assure life or safety. Six models are available to detect various detection target gases; GW-3 (O2) Oxygen(Galvanic cell type) GW-3 (OX) Oxygen(Electrochemical type) GW-3 (CO) Carbon monoxide GW-3 (HS) Hydrogen sulfide GW-3 (C-) Carbon monoxide GW-3 (CX) Carbon monoxide, oxygen The Riken Keiki GW-3 is the successor of the GW-2 gaswatch of Riken Keiki. As to its previous model is the GW-3 wearable as watch due to an optional wrist band.