When using the ruler (measure) tool the result is sometimes difficult to read if it is over another object. It would be nice for it to have a white-out behind like dimensions do to make sure it is always visible.
Here is a screencast of the issue: https://autode.sk/3dwWfPu
You can see the total length of the measurement also on the top-left of your screen:
But still it would be nice if the same value, shown at the place where you are measuring, should be better visible.