A while back, I borrowed a much simpler air quality monitor from a local non-profit. In the same location, under very similar circumstances, this monitor simply shone green, telling me that the air quality overall was ‘good’. I suspect that rating was purely based on PM, with no or little attention paid to VOCs or CO2, and certainly not to radon. For those measures, I would have to use additional monitors at greater cost overall. Working with the ViewPlus has been so much more satisfying and useful than the simpler, albeit much cheaper, basic air monitor. It offers excellent peace of mind and is easy to use, great for data nerds too, and works well with the Airthings Renew air purifier.