What is the name for a glass or metal applicator that directs electric current from a machine to the client's skin?

The term for a glass or metal applicator that directs electric current from a machine to a client's skin is "electrode." Electrodes are essential components in various beauty and skincare treatments, particularly those that involve electrical stimulation, such as microcurrent therapies or electrical facials. They are specifically designed to transfer electrical energy directly onto the skin, facilitating the treatment process and promoting desired effects like muscle toning or skin rejuvenation.

In contrast, a vacuum is an entirely different tool used for suction rather than directing electrical current. A conductor refers to a substance that allows electricity to flow through it, but it is not specifically linked to an applicator used in beauty treatments. An insulator, on the other hand, is a material that does not conduct electricity, further distinguishing it from the function of an electrode. Thus, "electrode" is the most accurate term for the device that serves this important role in skin treatments.