The Clipper Model 400 Office Tester & Cleaner offered by Grainman is an extremely efficient cleaner for office and laboratory use. This machine will provide accurate, dependable performance for small lot cleaning, testing or sampling. It is commonly used in seed plants for sampling large lots of seed for correct screen selection on larger, commercial size cleaners. The Model 400 has a compact, portable design and features an eccentric (shoe) drive that uses two (2) 10" x 15" screens. One top screen for scalping, one bottom screen for cleaning and grading. Perforated metal or wire cloth screens are available in over 175 different sizes. Other features include a powerful bottom blast fan driven by a three-step pulley, adjustable slide on the air intake openings to provide intermediate air regulation and an optional, removable catchall with removable trays (shown) to catch air screenings.