Works great so far. Measures CO2, temperature and humidity. Readings are almost instantaneous and definitely accurate. Turn on CO2 and the counter will steadily increase. The controls are a bit clunky, but they work if you take the time to read the manual and set it up properly. I couldn't find a way to turn it off, but it turns off automatically after 20 minutes, and I ended up actually finding it useful so I can control it over time and in multiple locations. Surprised that outdoor CO2 levels are typically half those indoors.
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