Do you trust on the weighing apparatus of some vendors in the Flea Market?

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My mother sent me to the grocery to buy a kilo of flour, a pound of butter, and some eggs. She told me to buy some vegetables and chicken, too. In the market, there were cucumbers, eggplants, green beans, and lettuce on the shelves. I could not make up my mind whether I would buy the green beans or lettuce. I went on the flea market section anyway. I told the vendor to give me two kilos of chicken wings and legs. He then placed it inside the plastic bag, weighed it on his weighing apparatus, and did give it to me. But I was a little doubt and uncertain with the amount of chicken that he presented to me. I just felt that it was not properly weighed or that the weighing scale was tampered or falsify with this vendor for personal gain. I do not want to argue anymore with that vendor because I know the problem will just get worse if I am going to argue with him. We, customers, were paying enough, but then some vendors were trying to deceive us. How about you guys? Do you trust on these vendors? Are you just taking it for granted deceiving you with these vendors? What would be the possible remedy of this problem?