I haven't gotten their PM sensor unit but have a CO2 sensor from CO2.click. About to pull the trigger on a PM sensor but just deciding which one. The founder th

I haven't gotten their PM sensor unit but have a CO2 sensor from CO2.click. About to pull the trigger on a PM sensor but just deciding which one. The founder there is active on a few places including Mastodon and I really like my CO2 sensor from them. Edit: sorry missed your price guidance. They are quite a bit more so probably not what you're after!