Numerical value for manual focus

I use manual focus a lot, but it’s very difficult to see how well focussed it is with a small screen.

As most of my photos are taken from a reasonable distance (mountain scenes in winter), I mostly want to use the same focal length all the time. The problem is that the focus adjustment is a dial with no numerical value, and not even an indication of where you are on the scale. This means that I can’t set it to a specific value that I know has worked before.

It would be really useful to have a number displayed for the focus.