... /24 Pin ; POWER SUPPLY TESTERProduct IntroductionThe power supply tester is a robust voltage, tester for PC-power supply ATX, BTX and ITX ... ;Plug-in your 24 pin power supply connector to mini tester;Check LED light if ON or OFF (+5V, +12V,+3 ... , HDD, CDROM, SATA, 4 pin(p4),8 pin(Dual-CPU). 6 pin (PCI-Express) LED power supply tester