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The high-frequency face machine is the only appliance in this list that specifically mentions producing a high rate of oscillation - a vital aspect for effective facial and scalp treatments. Ultrasonic cleansers function as a tool for gentle exfoliation and pore cleaning and do not provide the same oscillation as the high-frequency machine. Microdermabrasion devices use a fine stream of abrasive crystals or a rough surface to remove dead skin cells, which is a different mechanism than the high-frequency machine. LED light therapy devices use different colored lights to penetrate the skin at varying depths rather than producing an oscillating current. Therefore, the other options are incorrect based on the specific requirement of a high rate of oscillation.