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Commerical 2 - 4.5 gram / second

What distinguishes espresso coffee grinders?
1. Design (flat or conical) of the burrs, diameter of burrs
2. Wattage and RPM of the motor (starting at 150 Watt and 1680 RPM and down to 900 Watt and 500 RPM)
3. Ventilation passive or active to take the motor heat out of the encasement, there is enough heat caused in the friction of the espresso coffee beans in between of the burrs to take care of.
4. Quality and durability of course.
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