The G450 Confined Space Gas Detector continuously measures up to four hazards (CO, H2O, O2, and percent LEL combustible gas) in air. The dust proof and highly water resistant housing is designed to survive the toughest environmental conditions. Most day-to-day functions are controlled with a single button, and calibration is fully automatic. Equipped with datalogging. The datalogger records gas concentrations and alarms on a moment-to-moment basis. Monitoring results can be downloaded to a PC for viewing, storage and evaluation. Includes an extremely loud audible alarm, built-in vibrator and bright wrap-around LED alarm lights visible from every direction. The top-mounted display changes color from green, to orange to red to help communicate the severity of the hazardous condition. Top-mounted display is easy to read even in the dark. Interchangeable battery packs for up to 25 hours of continuous operations.