I sent it back today on Amazon.
1.5 L water bottle I have weighed with kitchen scale, the result was 1519 G (1.5 L and 19 G).
The Karcher Luggage Scale I came up with the same bottle at 1.15 and 1.25 L (usually 1:25 L).
I have 3 images on Amazon uploaded so that man sees it.
I admit there now 2 stars because it is useless for me, it's all in their suitcases each weight (holiday, flight), I can not measure about ...... that it is different has it many years ago Aldi demonstrated (unfortunately the machine broke after 5 years)