Summary

This is one of the most complicated Arduino devices I've ever built.
It's a 3D case for a phase meter, which I haven't finished yet, but the box is ready. No cover, as it is not yet clear.
The basic idea is to monitoring 3F 220V voltage and storing the values on an SD card. The box will hold all components: 3 transformers, arduino nano, LDC, knob and filter circuits.
Unfortunately, due to lack of time, I have not yet completed this project.
I've written arduino code, but it's incomplete. Unable to measure frequency. When I have completed this project and solved the problems related to it, I will put a link to the project here or update this page as well.

the dimensions are as follows:
125x85x40 (mm)

Help yourself if this suits you for your project!