Am a rookie but everything i have read says the quart size mason jars seem to cure better than any other size. personally, I don't understand what difference it would make but what i don't understand would fill a couple football stadiums.
What is the accuracy of those cheap hygrometers? if it is only accurate to +-%5 and we are trying to maintain 60% - 65% in jars. it would be pretty much useless would it not?
Personally, i don't see the need to have one in every jar. if you pulled 'em off the line when the stem bends slightly & snaps you should be pretty much on target right off and all jars should be about the same. just rotate the hygrometers you have when burping.