Very interesting!
I’m comparing one SDS011 with an Ecowitt (link) and the result is an average difference of 52%. But I do not have a certain reference that allows us to understand if WH41 overestimates or SDS underestimates.
You have been able to adjust one to their own average.
Maybe i need to add more SDS011 sensors to not suffer the potential error of a single (maybe i have the worst and i don’t know) 