The SGT is a two-year, disposable, single-gas personal gas detector. It offers a compact, lightweight and affordable solution for personal protection against the hazards of hydrogen sulfide, carbon monoxide, ammonia, nitrogen dioxide, hydrogen, sulfur dioxide and oxygen deficiency or enrichment. The device will operate continuously for two years with minimal maintenance. It is ideal for use in environments where these hazardous gases may be present, as it is a simple and effective way to alert people to an impending change in the atmosphere.