Not sure if very reliable but there's an app to analyse size distribution using camera: https://coffeeadastra.com/2019/04/07/an-app-to-measure-your-coffee-grind

Not sure if very reliable but there's an app to analyse size distribution using camera: https://coffeeadastra.com/2019/04/07/an-app-to-measure-your-coffee-grind-size-distribution-2/ https://coffeeadastra.com/2019/04/07/an-app-to-measure-your-...