I have just managed to get my new Honeywell HPMA115S0-XXX connected up, after a saga with the Molex 51021 connector.

And so tonight I am running a side-by-side test with both devices sampling the same air, to observe any differences. The Honeywell device is meant to come pre-calibrated and with an accuracy to within 15% on its readings.

Tonight's experiment will be running inside due to rainy weather forecast for the early hours of the morning and continuing into daylight, so the readings will not be comparable to any other Eastbourne Luftdaten results.

Here are the graphs for PM2.5, Honeywell first.
Honeywell PM2.5 SDS011 PM2.5

Here are the graphs for PM10, Honeywell first.
Honeywell PM10 SDS011 PM10

If the early results are anything to go by then it looks as though the SDS011 has been reporting lower than actual values so far. However, I think the reported values for outside air measurements with the SDS011 have been good because they have been similar to the readings from other Eastbourne sensors. Go figure.