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I also bought this device to repair old radios - and to keep the voltage across my isolation transformer fairly constant.
It does the job and does it well. Jus don't depend on the dial calibration for a voltage reading since the knob is sometimes off by a notch or two.
Use your volt-meter to confirm exact voltage.
I bought one and it does work well, excatly as described and pictured. These are brand new in indivual boxes with foam packaging. The transformer wire is a little coarse so the change is actually in a series of small steps. I bought it for repair of old radios and it is excellent for that task.
Made in China