Original poster: Thomas <tom-at-pwrcom-dot-com.au> > This might be handy too: > > http://www.sciam-dot-com/article.cfm?articleID=00000ED3-69CA-1C72- > 9EB7809EC588F2D7 > > It's a DIY field mill for measuring electric fields. It will > give you a good ambient reference. > > Tom L. > And something like this: http://www.uksmg-dot-org/pulse.htm http://www.payton.cps.k12.il.us/magnet/design/design_shop.htm