When I first bought a 758 I 'calibrated' DSLR to it with https://www.sekonic.com/united-state.../overview.aspx

Absolute insanity, I used the Target, etc

This is years before I joined here and started LF.

Now I use it the way several have posted.

And I always try to guess my exposure first then use the 758. Sometimes it agrees with me. Then I may shoot 2, first my guess then it's.

May as well keep the expensive widget.

On strobes it exactly matches my PCB Cyber Commander. The strobes are linear stop to stop , so i never need to check again with 758.