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I forgot to mention that I do use a rubber band. I didn't find it that complicated. You've got two spokes (of any length) held in tension across a rim. You measure across them to the ends of the nipples. Then you measure a nipple and add that (x2) to the total spoke distance. I repeat twice more to account for a rim being out of round. It maybe takes 10 mins max for two rims. If you're feeling lucky, you can assume that your rims have an identical ERD and are sufficiently round to warrant one measurement.
Thanks for the replies!
@fizzy.bleach
Thanks for sharing your method. You're right, it seems a little less complicated than dealing with the rubber band. But you still have to take multiple measurements and pulling the spokes together and taking an accurate measurement at the same time sounds a little tricky.
@mdcc_tester
Haven't thought or read about this method before! Thanks for sharing it. It sounds a lot easier and you only have to take one measurement per rim. I'll give both a try and see if there's any difference.