Which machine consists of two positive electrodes called an anode?

The machine that consists of two positive electrodes called anodes is the galvanic machine. In galvanic treatments, the electric current is applied to the skin through these electrodes, facilitating the introduction of ionized substances into the skin via a process known as iontophoresis. This method uses the principle that like charges repel and opposite charges attract, allowing for good penetration of products into the deeper layers of the skin, which can lead to enhanced therapeutic effects.

Other machines mentioned, such as high frequency, microdermabrasion, and ultrasonic, do not use anodes in this manner. The high frequency machine utilizes an electrode that generates ozone and produces vibrations for various skin treatments but does not consist solely of an anode setup. Microdermabrasion relies on mechanical exfoliation and does not involve electrical currents, while ultrasonic devices use sound waves for skin treatments rather than electrical currents through electrodes. Hence, the galvanic machine is uniquely defined by its use of two positive electrodes, which is why it is the correct answer.