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Because Question
Means Interest.

Is it possible to verify whether the actual brightness of LED screen corresponds to the agreed figure values? How can I be sure that I receive the same screen the manufacturer presened in his offer?

There is no certainty, all depends on manufacturer's credibility. Various manufacturers use various methods for determining brightness and other image parameters. That does not assure that figure values of individual manufacturers are identical. There are manufacturers who determine total brightness of LED screen based on theoretical calculation, e.g. LED diode output x LED diode amount. That is quite a misleading value though because such a brightness is just hypothetical. Every manufacturer should have special equipment at his disposal capable of measuring a brightness of every LED screen. But such devices are too expensive and not many manufacturers can afford them. Other manufacturers just don't measure brightness and other parameters because it would prove their weak competitiveness.