Dependable MultiGas detector tests for LEL, oxygen, carbon monoxide, hydrogen sulfide, sulfur dioxide and nitrogen dioxide, Economical construction saves users more than 50% on calibration gas, replacement sensors and maintenance. Four-year sensor life means detector lasts 60% longer than the industry average. Unit uses 50% less calibration gas per minute than the average detectors within the industry. Two-tox CO/H2S sensor removes practically all cross-channel interference. Large buttons and high-contrast screen make operation easy in low-light conditions. Ribbed rubber housing provides secure grip and high durability. Unit features 95+ db alarm and ultra-bright LEDs. Exclusive end-of-sensor warning cautions user when unit's sensor needs to be changed. MotionAlert tells others that user has become immobile. InstantAlert provides manual alarm to alert others of a dangerous situation.