Very good product overall, rather fine balance, very large display screen. When unpacking, I find that the product is not sufficiently protected ... like tray is glass, I feared it broken, heuresement not. regarding weighing accuracy, there is a 100g difference, that is to say, on 3 successive climb: the first climb: normal weight, the second climb: 100g weight with most 3rd uphill: weight of the first ascent . That does not bother me because I'm not a 100g pres .... regarding the impedance: works very well, but I can not know if the data is correct because affchées can not compare to another balance . if not in all, I am satisfied with the purchase and think it is a good product quality / price ratio.