The CO50 is a desktop CO Monitor which measures and displays carbon monoxide concentration, air temperature and humidity simultaneously. The CO50 features visibly bright LED lights which indicate active monitoring (green) or a surpassed CO alarm threshold (red). The meter also features an extra loud audible beeper alarm, electrochemical CO sensor, record/recall Max reading for CO concentration and CO calibration function in fresh air. Product is complete with Universal AC adapter (100V-240V) with multiple plug types (US, EU, UK, AUS) and a user’s manual.