Features: The LCD displays various parameters such as output voltage and PG, and when each parameter exceeds the normal value, the buzzer will sound a warning sound and the corresponding value will flash This power tester only needs to connect the ATX connector of the power supply to simply and intuitively know whether the output of each power supply is normal It can detect ATX, BTX, ITX, TFX computer power supply, and can display the voltage and PG value of each group of liquid crystal to quickly detect the performance of computer power supply. Easily test your computer power supply and avoid damage to computer equipment Small and practical power tester. It can also measure the output wire 24 PIN and P4, P6, or P8. Specifications: Material: Aluminum Alloy 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, 8pin, 6pin PCI-Express. 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 include: 1x Digital Power Supply Tester