How to calibrate DSO Nano v2 with BenF's firmware v3.64?

I wonder how to calibrate my DSO Nano v2 with BenF’s firmware.
I got a Fluke 179 TRMS Multimeter to test with.

What do i need? and how do i do?
Want my sinus waves to be as accurate as possible thats why i want looking in to calibrate :slight_smile: