CaseBuy LCD EZ Power Supply Tester 3

Performance:

Our first tests of the CaseBuy LCD EZ Power Supply Tester 3 simply revolved around connecting the unit to various power supplies and cables. During that, we had not run into any problems -- the device properly indicated when the cables were connected, etc...

However, continuing to provide the Phoronix advantage of going beyond the standard set of tests, we investigated the accuracy of this power supply tester. We had used two separate digital multimeters that we knew were calibrated, and would clearly reference the numbers against the CaseBuy tester. After testing the CaseBuy LCD EZ Power Supply Tester 3 in a variety of setups, we were disappointed in the numbers reported by this LCD tester. The provided documentation has a margin of error of 0.1V in either direction, which is quite significant to begin with, but during our tests the reported numbers had up to a 0.2~0.3V discrepancy. With the various voltage rails monitored, the CaseBuy unit had reported significantly different readings from the two digital multimeters. The CaseBuy LCD EZ Power Supply Tester 3 (or should we say Young Year YE-PST-IV LCD) was fairly inaccurate when it came to reporting the Voltages.

Conclusion:

While the device does look handy, and even has an LCD for showing the Voltages, we had found the product to be inaccurate when completing any critical tests. The CaseBuy LCD EZ Power Supply Tester 3 can certainly be used for quickly diagnosing whether a power supply may no longer be functional, or if the voltages are substantially off, but for specifically monitoring the Voltages this product is useless. We had compared the CaseBuy LCD numbers against that of two different digital multimeters, and in our tests the numbers were clearly dissenting and usually greater than the +/- 0.1V margin of error.