Not op, I’m not seeing anything about calibration for PM or VOC just stuff for open air bump tests. Interesting alternatives to filter load and PIDs I wonder if they’re robust enough to find their way into EPA or OSHA level investigations, I haven’t run across them yet
I have a second hand surface still running windows that I draw on. With a paper like screen protector I find it quite pleasant. Mines a 6 I think, runs Krita great I imagine it’d be even better if I ditched windows bloat.