Levenhuk Wezzer PLUS LP90 CO² meterThe Levenhuk Wezzer PLUS LP90 is a compact CO meter that can also measure air temperature and humidity. The small device warns you when the CO or humidity levels are too low or too high, making it uncomfortable to be in a room. If the carbon dioxide concentration exceeds the recommended level for ventilable rooms, the device warns you to ventilate the room. There are digital warnings on the LCD colour display and audible warnings. You can also turn off the beep.Another useful feature of the Levenhuk Wezzer PLUS LP90 CO meter is the recording of maximum and minimum values. The device also calculates the average CO level every 15 minutes or 8 hours. This makes it possible to determine whether there was enough oxygen in the room during sleep. By regularly analysing the data obtained and following the ventilation recommendations, you can create a more comfortable atmosphere in any room, be it the bedroom, the children's room or the office.The device is AC powered (a mains adapter must be purchased separately).Features: - "3-in-1" gadget: thermometer, hygrometer, CO meter -Elegant, minimalist design: a tabletop device in the shape of a hemisphere with LCD display -Warns you when humidity and CO levels are exceeded -Progress of CO levels: Maximum, minimum and average values.