I am looking for recommendations for a reasonable calibration service for a HP 34401 DMM in the San Diego or Orange County areas. I recently got one off of ebay. The outside is a little rough, but some performance testing against another 34401 from work didn't show any glaring errors. I would like to be able to use it as a transfer standard for doing home-gamer level calibrations on some of my other gear (Tek 744a, hp 3314a and eventually my 8642a)