Nuevos análisis independientes de proteína whey

Heres my ELI5 attempt. I just want to explain to everyone how this works and how much error there might be.
Different molecules absorb light at different wavelengths. What the test aims to do is then shoot a beam of light through a the wavelength that corresponds to "protein", and see how much of that protein light comes out the other side. The machine uses this to determine the concentration of protein in that sample.
However, this only works in liquids, so the powder must be dissolved uniformly. One of the largest problems with all of these tests, is making sure the powder is well dissolved in the liquid. A protein powder can suck at dissolving in water, but still have really high protein content. But this clumpy protein would completely mess up the results of "how much light that corresponds to protein is absorbed by the solution". Additionally, protein is often shaken up in water etc. and this is okay for us, but even tiny bubbles would mess with light absorption measurements.
I do have access to the equipment to do this kind of test myself, but the way I see it, the results are so worthless, it's not even worth the time or set up. I wouldn't even use any of these results (or results done by fittit in the past) as a guideline to make my protein powder purchases.