For use in a confined space or open area, GfG’s new G450 multi-gas monitor is easy to operate, read and carry. The lightweight (10 oz.) unit monitors O2, H2S, CO and combustible gases. Features include automatic calibration; 24-hour continuous operation; large invertible display; IP67 design; loud 103dB buzzer; and bright, flashing alarms.GfG Instrumentation, Ann Arbor, MI.