EZ Power Supply Tester Reviewed
 

So, if your PSU is fine, this tester will indicate just that. If the
supply if broken in one way or another, EZ Power Supply Tester will give
you very little information on what is wrong. In the worst case, the
tester itself can get damaged in the process. In my opinion the low price
doesn't justify the low usability of this product.

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http://metku.net/index.html?sect=vie...ster/index_eng