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Professional device, easy to use. The power supply tester is a robust voltage,tester for PC-Power supply,protect your computer from damage. Voltage source:20/24PIN (ATX Connector). Green Indicator light=Power is OK. VOLTAGE TEST: 12V,-12V 5V,-5V 3.3V, 5V STAND BY(SB), POWER GOOD(PG) Descriptions: Easy use ,the operation instruction on the face of tester Connectors: HDD,CDROM,SATA,4PIN(P4),8PIN,6PIN.