Let me first preface and say that the Dr. Mills DM-7441 is the best under $25 spice and coffee grinder I have ever used.
It’s quite simple, put your coffee beans and hold the button down and the longer you hold, the more finer the grounds become.
This is important because other grinders, even after a minute of grinding, they are not as fine. The Dr. Mills DM-7411 Spice and Coffee Grinder really does a magnificent job in grinding and it comes with a scoop/brush, to help clean the unit.
While it’s not difficult to clean, those who want to give it a thorough cleaning, will want a grinder with a detachable cup.
But I have used this to grind my coffee beans and no problems whatsoever! It works perfectly and grinds much better than other coffee grinders that I have used.
The Dr. Mills DM-7441 Spice and Coffee Grinder is highly recommended!