Tenma 3 Amp Variable Isolated A/C Power Supply. This is for testing and repairing TVs, amplifiers, ham radio equipment, etc., while isolating them from the A/C power line. It contains an isolation transformer and a Variac. It has a meter that shows the input line voltage, the output voltage and the current the connected device is drawing. It weighs 26 pounds. Priced for a quick sale.