Inexpensive indoor air quality monitor

These are $38 on Banggood. It measures temperature, humidity and airborne particulates. Laser light scattering technique, the same as in my more expensive Purple Air I wrote about previously. These are display only, two screens, no connectivity but perhaps that’s all you need for something you place on a shelf.

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Thanks to my friend Roger for finding these. I bought two and loaned one to our neighbor who promptly used it to check in vs out and verified his AC filters.

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Anyway, it’s well made and cheap, so if you want one I say get it.

https://m.banggood.com/PM1_0-PM2_5-PM10-Detector-Module-Air-Quality-Dust-Sensor-Tester-with-2_8-Inch-LCD-Display-for-Monitoring-Home-Office-Car-Tools-p-1588436.html