Amrex Stim Unit MS-322 AC Low VoltAmrex Stim Unit MS 322 AC Low Volt The Amrex Stim Unit MS 322 AC Low Volt combines proven reliability and ac power in a compact, low volt ac muscle stimulator. The MS322 is a single channel, two pad, low voltage electrical muscle stimulator that produces pulsation, tetanize, and surge output. Low Voltage AC Output: Delivers alternating current pulses for effective treatment. Adjustable Parameters: Customize treatment intensity, pulse width, and