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Not sure why anyone would tell you that? I have a HEQ5 pro which I run on a lab power pack rated to 30amps at 13.1 volts with no trouble at all. I would imagine any regulated 12V power supply capable of 3 - 5 amps would be OK. Centre pin positive and I believe the hand piece is reverse polarity protected in any case. Please correct me if I am wrong here.
Mark
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