FYI, from a review on that PS

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June 10, 2011 at 1:45 pm #4353
swoon

    FYI, from a review on that PS tester on Newegg (and this is why I never would trust any of these cheap black box testers and instead use a multimeter)

    Don’t trust this, get something better. The screen only lights up for the 20/24 pin connector and when you plug in a modular connector the device simply looks for any amount of voltage. It does not see if the voltage is too high or low, the light will light up green regardless. I connected my 5V rail to the 12V on this device and light was still green, same with connecting the 5V to the 12V on the device. Useless because if the PSU has 2 rails and one rail is failing this might fail to detect the other rail while your power supply kills off hard drives and optical drives, as it was doing in my case. A cheap voltmeter can put this device to shame.