... ; LED; PC 20/24 Pin ; POWER SUPPLY TESTERProduct IntroductionThe power supply tester is a robust voltage, tester ... 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,+5VBS,PG);Plug ... 5V,+3.3V,5V Stand by(SB) 12V, power Good (PG)Connectors: Floppy, HDD, CDROM, ...