The Model 120 Automatic Power Control provides complete electronic support for the Model 110 Automatic Twin-Jet Electropolisher. It controls the electrolyte flow via the motor speed, polishing voltage circuit, light source, detection sensitivity, and photocell shutoff circuit, including audible and visual indicators.

Two analog meters indicate the polishing voltage and current levels. A switch selects whether or not current is applied, enabling either electropolishing or chemical etching. A single connecting cable links the power control to the electropolisher.