For folks that have a portable or handheld AQI/PM2.5 reader — which one do you have, how to you like it, where did you buy it, and what did it cost?

I want to get a AQI/PM2.5 reader, and I want to get a portable one so that I can take it a few places (gym, classroom (I’m taking a Thai class), co-working space, etc).

If you have one, which do you have and how do you like it? Also, where did you buy it and what did it cost? (ballpark).

*edit*

Thanks for the links everybody.

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