3 ms·

Thanks for sharing. I wanted to get Winsen MH-Z19B, but Senseair S8 (residential) looks like a better, more reliable option, for a DIY project. One comparison:

• throwaway9d0291 7y ago
  If you'd asked me a few days ago I'd have said that the MH-Z19B is okay on a budget but now that I know you can get an S8-0053 for $20, I don't think I can recommend it. If it's difficult for you to get the cheap S8s for some reason though, per that thread it looks like an MH-Z19B with calibration off is a decent choice.