Quick update. My densitometer is on its way, and Stouffers arrived today. I have also ordered a lab calibrated thermometer, as I really would love to know what is 20˚C, precisely. I realise that it does not matter that much, as long as I settled on some repeatably fixed temperature X within a shooting range of 20/68, but this gives me a chance to get one other variable a bit more fixed. So my testing is now delayed until week of 9th July. Will catch up on printing in the meantime.