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Check the listing for details. 1-3HP Air Conditioner/Refrigerator Inverter Compressor Tester 1500W DC Fan Test. Condition: New. Listed at 79.47 USD. Support high power air conditioner DC fan load testing up to 1500W. The connection must be made in the order of UVW. A wrong connection will cause the compressor to reverse or fail to rotate. - Power on the detector and turn on the power switch.