Mickey: How does one test efficiency rating on a power supply? As a consumer just being...

I have a few power supplies sitting around over the years, and I was wondering how hard it is to test 80 plus power efficiency? I know JohnnyGuru and others do this, does it require specialized equipment or can an average consumer like myself test to see what performance I am getting at say 50% load, etc. Probably would need to buy a wall outlet watt reader, but what else would I need?

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