I have several different Air Quality devices (PM2.5, CO2, RH, Temperature) in the $85-$275 range and it (at $130) shines to be fairly accurate in all of these measurements. It also measures tVOC and I can't speak to the accuracy but it seems pretty loud. It has many unexpected benefits such as 1) Wi-Fi connectivity to display date/time and local weather along with all other information and 2) allows you to use the touchscreen to view graphs of every single reading over the last 24b hours view or 30 days. All of this in a very small form factor that sits unobtrusively on my desk when plugged into a USB outlet. I would highly recommend this outstanding piece of technology to anyone who wants to monitor and record the air quality in their home in real time! However, I suggest that the manufacturer add instructions for choosing temperature units (C or F) to the English version of the user manual, as not everyone will have fun solving this puzzle on their own.
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