The answer is a galvanic machine. It uses electrical current to introduce water-soluble products into the skin during a facial.
A high-frequency machine works differently — it's generally used for its stimulating and germicidal effects on the surface of the skin, not for driving product deeper in. A steamer opens pores and softens skin but doesn't run current at all, which is why galvanic is the specific machine tied to product penetration.
This is 1 of the real Tools & Equipment questions in fadejunkie's 299-question bank. See the Tools & Equipment practice questions page for a fuller sample, or try the Tools & Equipment practice quiz and flashcards for free. A one-time $15 lifetime pass unlocks the complete question bank across all 13 tested topics.
More real Tools & Equipment questions: Which Shears Chop Out Pattern and Texture?, What Soap Goes in an Electric Latherizer?, What Is Razor Balance?, What Tool Handles Sharp Edges and Detail Work?, and 8 more on the Tools & Equipment practice questions page.
Browse every topic on the Practice Question Hub, or see the Texas Barber State Board Exam Guide for the full exam process — required hours, PSI scheduling, and fees.