Controls
Selectable, not guesswork.
Stepped knobs set pulse rate, surge on and off times and reciprocal timing, with a separate intensity knob and output indicator for each channel.

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Amrex MS401B
The Amrex MS401B is a four-channel low volt stimulator that drives up to eight pads, with a choice of bi phasic or mono phasic output.
Run it in continuous, surge or reciprocal mode with selectable pulse rate and on/off times. A safety reset in the intensity controls, a patient stop switch and a 30-minute timer round it out.
Controls
Stepped knobs set pulse rate, surge on and off times and reciprocal timing, with a separate intensity knob and output indicator for each channel.
Four. Amrex specifies it as a quad-channel stimulator that supports up to eight electrode pads.
Yes. This is a prescription device. US federal law limits its sale to licensed practitioners or to buyers acting on a practitioner's order.
Amrex covers the generator for 2 years, parts and labor.
Amrex warranty: 2 years on the generator, parts and labor.