ATX 2.0 LCD Power Supply Tester (20/24 pin ATX, SATA, P4, Xeon, PCI-E, Floppy, 4 pin) Featuring a back-light, bright blue LCD display - this tester can verify that every part of your power supply is operational. It gives voltage read-outs and beeps if there is a problem. It even works with 20-pin power supplies (though it will complain about missing second 12 volt rail). To use it simply plug the tester into your power supply's 24 pin molex connector and it will give a full diagnostic of your power supply. If it reports a very low, high or no voltage at all, it is highly recommended to stop use of the power supply. This Power Supply Tester can test 20-pin power supplies.
Warning: This product is designed only for power supply output tests. Do not leave it connected to the power supply unattended. It generates heat and could possibly damage your power supply.