Scales are crap, you can't guarantee that the scales will be accurate enough to give constant accurate weight at the low weights that Vic is expecting on as small pen blank.
Moisture meters have come on a long way over the last 20 years and know that I use one regularly that requires accurate measurements. If it's good enough for weights and measures then it's good enough for a bit of pen turning..
Anyway Vic, never used microwave of small pen blanks but have used it on larger pieces, I have seen the link Walter has put up and is very good.
But I would say that the 10 to 16% that Ray quotes if consistent with allot of the evidence I have managed to gather over the years and has worked well for me.
But then again what do I know init, only my opinion.. Init..