I think this is the most inaccurate sensor that doesn't cost an absolute $150! Will send it back asap due to incorrect readings. At first I expected IT to fit in your pocket and be small - it's huge and definitely not pocketable! Lots more on hand than it looks in the picture and hard to keep in pockets unless you have huge pockets no one else has. It's also very noisy, when the fan comes on you can hear it and if it's used for a short time it's ok, but it's not written anywhere. How long does it have to stay on to get an accurate reading? Eventually it turns itself off after 2-3 minutes I think. Completely inaccurate! I knew it had to be small and didn't expect it to be super accurate. But I tested some other high-end fixed sensors and even turned on the image with the Awair air quality monitor (highly recommended) set to show CO2 because that's the only thing I get at my workplace and is important at home. Awair shows very close and accurate numbers as seen in the photo. HUMA should show the CO2 scale at 50% when it reaches 1000ppm CO2 but as you can see in the photo HUMA shows the scale not moving at all and I waited the full 3 minutes to get the results to obtain. HUMA CO2 values were displayed on the first day when first switched on, but then the CO2 value was not recorded. If it can't read CO2, which is the design, I can't trust other measurements. Its return I'm disappointed as it wasn't cheap and you can get cheaper more accurate instruments, unfortunately not in this size although I was looking for a pocket sized device and this one isn't! My expectations were not met and I will no longer look at the Huma line of products. It looks very plastic and cheap. It is expected to be a higher class like the AWAIR, much higher quality and very accurate, unfortunately not pocket sized.
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