Couldn't you just click on the evaluate tab which is right next to your sketch tab, then select your 'measurement' tool and measure from point to point?
Thanks a lot
Also, if you select both points, the distance is displayed at the bottom of that screen as well as the x-y-z distance from each other.
in the picture seems to be showing your selected object located in 3D from the origin.
Just a tip to help you get by faster if you didn't already know that.