Test specimens are tumbled in the cork-lined test chamber by a pair of aluminum impellers rotating at a constant speed of approximately 1 200 rpm for up to 60 minutes. After each test the specimens are removed, lightly cleaned, and subjectively evaluated. Susceptible fabrics will develop lint pills typical of everyday wear. Users have also found a high quantitative correlation for surface appearance, changes in appearance, scuffing, fuzzing, and color loss.More wonderful, please visit:http://www.testextextile.com/product/random-tumble-pilling-tester-tf224ab/