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Re:The Weight of Numbers: Air Pollution and PM2.5 by oh_sigh on Wednesday August 08, 2018 @06:27PM (#17720104)
I have this one and it works quite well: https://www.amazon.com/gp/product/B071RF6B2Y

I compared it with a friends much more expensive device, and the results were within 5% of each other.

Re:The Weight of Numbers: Air Pollution and PM2.5 by sonofblah on Wednesday August 08, 2018 @06:50PM (#17720288)
None on Amazon appear to have overall high ratings.

There's probably opportunity in the space for someone who can create an effective, reasonably-priced model.

Re:The Weight of Numbers: Air Pollution and PM2.5 by oh_sigh on Wednesday August 08, 2018 @09:50PM (#17721147)
Agreed. I was concerned about ordering mine based on the reviews, but after looking at a lot of reviews, it is because people didn't read the manual(or, couldn't understand it's Chinglish). The actual product itself works well though, and the readings were within a few percent of my friends Fluke 985(~$5k particle counter - because he is a HVAC professional).