Aranet4 HOME CO2 Monitor

Such a great product Built like a tank

Fantastic product. User-friendly and reliable device for checking quality of ventilation in a closed environment. Essential adjunct while COVID and RSV still circulating + infection risk. Small enough to put in your pocket or handbag. I recommend sticker with metrics as easier to remember limits and measures of CO2 and humidity. Warning beep clearly audible.

Does exactly what it claims one of (if not) the most reliable and more affordable now too