This script started out as a reply to the question of how to assign a shortcut to the tape measure, :)
I tried to find it in the customise interface but quickly gave up and thought this would be a better solution as it places the tape* for you and prints the result to the text box and also copies it to the clip board. *(although to their centres only atm which may be inaccurate depending on how big your objects are and just where you want to measure to)
This will at least speed up the process of measuring.
Pick the the two objects you want to measure via the pick buttons and click go and presto the distance between their centres is displayed in the text box on the script ui. It also places a tape measure between the two objects so you can finesse the positions of the tape and its target. You'll have to go to the Modify panel to see the resulting adjustment of any repositioning you do.
The measurement is also copied straight to the clipboard so you can paste the result wherever you need it.
It also uses the units in your setup
To install just drag and drop to one of the viewports
Then go to customise ui look for Lukes' Tools - Tape measure
Made a couple of little changes to grab the tape or its target which will speed up work flow.
Rich text format download
Fixed the self installer download from