This is an older M325-F so it does not have the "over-temp protection"  that is on the current 325-H though it does have a fan to keep everything cool.  This power supply is infinitely adjustable from zero to 9.48 volts.  9.48 is the maximum I could get the meter to display, but an external digital volt meter showed the power supply actually delivering 9.95volts (Koford advertises it at a 10-volt supply).  It does supply up to 20 amps at all voltages.  Great for breaking in motors (up to and including Group-27), or running tire truers, comm lathes or other DC powered devices.  As you probably know, this item new lists for more than $300.00.

The knob turns the power on a off and serves to adjust the voltage.  The toggle switches the digital meter from volts to amps (cannot be viewed at the same time).  

Also included is a one-page instruction sheet with tips for breaking in motors - very helpful!

This listing may end at any time as the supply is for sale locally.