Mazzer ZM FilterZM Filter Coffee grinder designed for specialty coffee lovers. Flat burrs Low coffee retention (<0. 45 g) Electronic True Zero calibration Low r. p. m. with excellent grinding speed Ventilation system with electronic control Micrometrical digital grind adjustment mechanism Can record up to 20 grind settings Grinding chamber easy to clean On demand dosing capability Double safety switch Patented lockable canister to keep coffee grounds from getting on