why did you need the voltmeter then?
Used it to troubleshoot and identify the 3 h-cards I requested an RMA for. Took a voltmeter to all the cards in the second rig while testing 16 cards one-by-one.
Also used the voltmeter to tune a couple Erupter Blades I have a while back.
Seems like a good geek tool to have in any respectable tool-bag either way.
good info. already seeing some results from your card rotation strategy.
any pics as to exactly where you put your probe tips? there must be a link somewhere. also how do you reach into the middle slots to measure? doesn't seem like enough room.