The medium to be tested is placed in a specimen dish that includes a replaceable stainless steel wear disc on the bottom. As the dish rotates, an integral drive shaft operates a set of gears which turn the spline shaft. At the base of the shaft is a pin holder with three (3) replaceable hi-grade brass pins that rotate in the opposite direction of the specimen dish. As the test medium flows between the brass pins and stainless steel wear disc, the material acts as an abrasive and causes wear.
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