The Prime deal on Amazon cannot be found in the Netherlands, when you click the link the price is 89.99 $ and no prime discount
Thanks for reviewing this charger. For us Samsung users listing the PPS range would be very useful. For some reason manufacturers don't list it and reviewers often also don't - why is that?
And I wonder why you question its accuracy. That 3% difference is likely caused by the resistance of your USB Cable and connectors. Using the values from the picture I calculated around 250mOhms, which is in the normal range of a medium quality cable.
I have seen much worse accuracy with all sorts of displays in chargers and cables. I would consider this astonishingly good - my Anker chargers display is certainly way more off! In reality nobody really cares, because for checking if a good charging speed is selected a ballpark figure is more than enough.