This digital luggage scale is supplied at a reasonable price even with batteries. Man raking the case then simply rakes in one or use the included case band.
The weighing result is very accurate, I also compared it before flying home with the bathroom scale. Multiple weighing experiments lead to the same result. In practice, then everything went wonderfully, so you can invite souvenirs to the baggage allowance with no surprises. The handle is ergonomically designed so that the weighing procedure does not cause problems even with heavy suitcases.
The weighing unit can be switched (g, kg, lb, oz) where I always weigh in kilos. The price is a small investment in the certainty at the airport to have no stress and therefore there from me 5 stars!