Communicating coffee grind sizes and grind distributions is hard.
Measuring those features typically requires expensive hardware, not easily acessible to most people.

This tool is an alternative, only requiring a phone and a printer. To analyze your grinds print this Template. The red dots should be evenly spaced on a 15cm grid.
Place the grounds of approximatly one coffee bean into the square and distribute the particles to reduce overlapping.
Proceed by taking a level picture in the next step and follow the steps to your final analysis.