Very pleasantly surprised by this invention. Very easy to use, easy to read and seems accurate (how do you actually know that?). When tested outdoors, the results were similar to published air quality data for my location. It reacts quickly to changes in air quality (blow out a candle and it goes crazy!) and thanks to its built-in rechargeable battery, it's easy to move around the house to check every room. The battery seems to last around 6 hours, but note that the battery bars disappear faster when it's empty. The display is very bright and it would be nice if it had a dimmer in the bedroom at night. The red/amber/green indicator is useful, although you'll have to look closely to tell the difference between amber and green. All in all a good and affordable air quality monitor. I'm glad I didn't spend more money, it helps!
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