Features: The power supply tester is a robust voltage tester for PC-power supplies. ATX . BTX, and ITX compliant power supplies can be tested. LCD display indicate the status of voltage . The PC / SPS is suitable for the ambitious hobbies, as well as for a quick functional check in a specialized trade. Test the power supply and avoid damage to computer equipment; no batteries needed. Specifications: Device Type: Power supply tester. Compatible with: ATX, BTX, ITX. Voltage source: 20/24 pin ( ATX - connector ). Voltage test: +12V , -12V , +5V , -5V , +3.3V , +5V Stand by (SB) 12V power Good ( PG ). Connector: Floppy, HDD , CDROM , SATA , 4pin ( P4 ) , 8pin ( Dual-CPU ) , 6pin ( PCI-Express ). Dimension: 3.8" L x 2.5" W x 0.8" H (97.7x63.3x20.4mm). Weight: 3.1 oz (87 g). Operation: 1,Plug power supply 24 PIN and P4, P6, or P8 into the corresponding jack of the power test suite. 2,Power on the device, you will hear a beep sound, if there is no flickering with the device, then the power supply output voltage is normal . 3,If a certain voltage signal was not detected, or the detected voltage value is over the normal, you will hear a long buzzer; if the corresponding voltage value or PG flickers as well, then the power has failed. Package Included 1 x Power supply tester.