Overview: **Guard Dog Security Air Quality Monitor - TVOC PM1.0/PM2.5/PM10 - Temperature & Humidity - Rechargeable Battery **Pros: - Offers many different air quality readings, as well as temperature and humidity readings - It seems to give accurate readings based on how it compares to other monitors I've compared against - Color screen looks good, at least on some pictures - Runs with built in battery or mains. Bad: A very confusing menu system and displays that feel redundant. It is not possible to keep the display active for a longer period of time. Bottom line: If you're looking for an air quality monitor to take occasional readings in a location or to check conditions in a room or room at work, this seems like a good option. But for a home monitor you want to be looking at to get a reading, this isn't the one. I couldn't figure out how to keep the display on after 20 minutes even with the device plugged in (it didn't go to sleep to save battery power). I plan to keep it in my garage and pull it out if I want to take measurements somewhere, but it's definitely not going to be the kind of monitor we leave in the living room or bedroom to monitor indoor air quality. Generally recommended for instant readings and portability, not recommended for a device that will be left in place in a permanent surveillance room.
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