Keene Engineering's Model 190 series Drywasher & High Banker Dredge Combination is the most advanced and user friendly unit on the planet. With Six Unique Patents to its credit, this series includes Soft Bed Technology which creates a whopping 7 milliamps of constant current, resulting in an electrostatic charge ten times greater than any other drywasher. This unit also creates a positive charge on all dust particles that reacts to the negative charge of the ground, creating virtually a dustless environment. Blast Gate Technology provides for infinite adjustment of vibration and air pressure while Scrubbing Pins separate and liberate stubborn gold and create an even flow of material. The enclosed riffle bed creates a dust free environment and a compact single unit design for an extremely efficient machine.