Russell McMahon wrote: > Hmm - W is Watt. So Watt am I really meant to use for Weber??? In case this was a serious question (hard to believe, coming from the master of internet search :) The nice brief reference at says "Wb". Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist