The Porlex Mini Coffee Grinder is compact (fits inside the aeropress) lightweight, and durable enough for any adventure. Manually powered, you’ll never be limited by batteries or electricity when you’re ready to grind coffee on the road.The grinder’s ceramic conical burrs are rust resistant, encourage grind uniformity, and will remain sharp for years. Located directly under the burrs is the grind adjustment knob, which allows you to easily switch back and forth between settings for french press, espresso, and everything in between.