Heavy with the large transformer inside. The unit has both an ammeter and a voltmeter. The supply is designed to be controlled by the front panel "low-high" control for variable voltage output with two selectable ranges of 4.5 to 10 volts and 10 to 15 volts via the slide switch marked "output".

the voltage mtr reading will read a bit lower than it actually is - tap on the plastic covering and it will register a more actual reading - not a blue ribbon winner but it wrks and is inexpensive 

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