Hello, Just wanted to mention to the group today I listed a Valhalla 2701B DC Calibrator on eBay. I have used this unit for about six years and it works very well except the HPIB does not work. It has full-scale ranges from 1.2V to 1200V and each knob goes from 0 - 11. Bought a 2701C so I no longer need the 2701B. From one volt-nut to another perhapsJ Thanks, mitch