If your PC’s power supply dies, you might have trouble diagnosing it; you might wrongly blame the failure on the power switch or a bad motherboard. You can unhook the cables from your PC, haul the whole computer to your local computer store, and pay $20 for them to tell you the power supply’s bad — or you can save some dough in the long run by picking up this CoolMax PS-224 Power Supply Tester.
The PS-224 will test the standard 20- or 24-pin motherboard power supply. An LCD screen displays the test results, and you don’t have to look up codes in a manual, like you do with cheaper models. The tester is accurate within +/- 0.1V, and it’ll set off an alarm if the voltage is too low, too high, or just not working. If you’re looking for an easy-to-use tester, this is it.
The CoolMax tester sells for $13 from PC parts stores.