Very good84/100
Small meter with memory function. Many display options, but an unlit display. In twilight, this is no longer of much use. The traffic light can only be read well directly from the front.
A sensor provides reliable readings for continuous monitoring of CO2 levels in buildings.
The screen shows the current CO2 concentration alongside temperature and humidity.
If a preset upper limit for CO2 is exceeded, the device alerts users via a visual traffic light display.