... is a robust voltage, tester for PC-power supply ATX, BTX and ITX compliant, power supplies can be tested, indicate the status ... methods of operation Turn-on your power supply ;Plug-in your 24 pin power supply connector to mini tester;Check ... ,-12V,+5V-5V,+3.3V,5V Stand by(SB) 12V, power Good (PG)Connectors: Floppy, HDD, CDROM, SATA, 4 pin ... 8 pin(Dual-CPU). 6 pin (PCI-Express) LED power supply tester