How can i measure 2 objects but very very sensitive way?

[kabu]

you can try:

Precision Drawing Tools (PDT) Add-on for 2.8x

Hi, I am intrigued by what this addon could do. I have taken a lot of tutorials for other cad software, but i am still very much a beginner at using cad. All I can do so far with this addon is look at all the buttons. Could you do a little video on what this addon actually does? I went over some of the documentation but I need help. I read something about how this addon would be obvious to someone that uses cad. So maybe this is out of my league.