Everything you and others have said so far does kind of make sense to me but all I can do is use the equipment I have to hand. The real strange thing about the switchable probes is that, with them switched in either 1x or 10x mode, after making the required adjustments on the scopes input selectors, the final measured values were almost identical.
I have today striped down the scopes and carried out re-calibration on the two in question and everything apart from the timebase has been confirmed as being spot on. I can't check the timebase as I don't have access to the required scope calibrator, but the vertical side is fine. Oh well, as I said, lets hold on for the Black Star counter to arrive, it might just work fine with that.
