... /24 Pin ; POWER SUPPLY TESTERProduct IntroductionThe power supply tester is a robust voltage, tester for PC-power supply ATX, BTX and ITX compliant ... methods of operation Turn-on your power supply ;Plug-in your 24 pin power supply connector to mini tester;Check LED light ... if ON or OFF (+5V, +12V,+3.3V,-5V,-12V ...