Thank you Bill. I think I found the exact same thing. I have to add them to the "need to order” list. I am very hopeful that I can get this whole analog ac/dc calibration nailed by the first of the year. Going at it from a mostly independent lab standards point, it is not an easy thing to accomplish for less than a WHOLE bunch-o-time and a little cash at the right moment. It is a great learning experience so far!!!!! Cheers, David