My solution might well be RTFM, so apologies in advance.
I've just attached a x10 probe to allow me to measure signals above 20V but I don't really know how to tell PicoScope that it's a x10 probe. I'm having to just multiply the displayed voltage by 10!
I've looked at the Tools->Custom probes menu but even when I select the x10 option from either "library" or "built in" it appears to make no difference.
Also, the channel vertical scaling only goes as low as 0.2, not the 0.1 which might be what I need.
Basic question is: how do I use a x10 probe?