Accurately measures gas concentration and displays information on large, clear, backlit LCD. Features superior dust/water protection, excellent impact resistance, great RFI performance and extremely effective alarm system. Distinct alarm indicated by (2) bright flashing LEDs, piercing audible alarm and internal vibrating alarm. Automatically records last 50 alarm or test events and has active datalogging. Infrared adapter with built-in IR communication port enables user to read data or change alarm set points. Adjustable alarm set points for LOW, HIGH, TWA and STEL. Rubberized armor housing and one-button operation provides durability and operational simplicity. Sensors and battery are easily replaced.