Will the mill/grinder be used for wet or dry milling? 2. For dry milling, ask how finely the material needs to be ground and what are the properties of the material? Rotor beater, disc, and mortar mills, for example, are best for midrange grinding (final fineness of ~ mm). 3. For wet milling, ask what capacity of grinder you will need. Bead mills are usually best for small capacity ...