I am the proud owner of a new-to-me HP34401A. It appears to have been never calibrated, aside from at the factory (calibration count 35) and that was in April of 1997.
So it's due.
Of course, I'm a hobbyist, so I'm looking for something relatively inexpensive. I do not have access to any more accurate equipment myself.
Thanks,
Dave J
PS -- the unit really really stinks of Old Spice and, I think, menthol cigarettes. I can smell it in any room I take it into. Anybody have any advice for cleaning? I've already run the bumpers through the dishwasher and scrubbed the external case down with soap, baking soda, and vinegar, all to no avail. I obviously don't want to go inside the unit, and I can't imagine it would need it anyway, since it's not a vented design. Looking for ideas!