They're all made by one of two companies, Youngyear and another I don't remember the name of. Each company offers one PCB and two or three casing styles. The sensing electronics are ultra-cheap, imprecise garbage with an imprecision as large as the ATX spec's regulations on voltage. Plus you can only test the voltage through the ATX 24-pin connector, so there's absolutely zero load on the PSU.
In other words, it's about as useful for determining the stability of your power supply as observing the patterns in tea leaves.
You can get far better results with a $10 digital multimeter and a paperclip to jump the PS_ON wire with ground. Though that's still extremely limited.
Are you looking for an industrial automatic load tester? Like the one pros such as JonnyGuru use to review PSUs? If so look for a SunMoon SM-268ATE+ or SM-5500ATE... have a couple thousand dollars ready.
^Heck, if he wants the best he should get in touch with Chroma ATE. That's what most OEMs' R&D labs use. Sunmoon, TechRed, etc. are just for the manufacturing and RMA departments, as well as internet reviewers.
A $4 Harbor Freight DMM is as good as a $25 one from Home Depot; 90% of DMMs up to $25 are near-identical inside the casing.
Above that I recommend the Fluke 83 III or 87 III, bought used. Avoid the cheaper Flukes (<$80), they're generally gray market items and some of them are cost-down.
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