Forbes

"A burr grinder uses two toothed disks to uniformly break down roasted coffee beans into specific particle sizes," explained Nathanael Mehrens, inventor and partner at Matchless Coffee Soda. Unlike a blade grinder, which is typically a lower-end machine that has a single blade (similar to a blender) to whir around and break up your coffee beans into inconsistently sized shapes, a burr grinder gives you control over the size of your coffee grounds." - Melissa Kravitz , CONTRIBUTOR, To Brew A Better Morning Coffee, Buy A Burr Grinder