Perten Type 3310 Laboratory Grain Mill 120V UsedPerten Type 3310 Laboratory Grain Mill 120V Used Working The Laboratory Mill 3310 is designed for grinding samples of grains, pellets, meals, feeds, and forages. The ground sample can then be used for analyses such as NIR, Falling Number, Glutomatic, Kjeldahl, etc. The Laboratory Mill 3100 is a hammer type cyclone mill, built into a soundproof casing. An adjustable vacuum feed control regulates the feed rate of the sample into a metallic grinding