At BRS they are checked every 6 months or so. The airport does checks as well on the occasion. A couple of months ago 1 of the scales were out by about 1 1/2 kilos out and the airport would not let anyone use it as if trading standerds found anyone usingit before it got fixed then there would be fines. All the scales have asticker on them saying their last check date andwhen they need to be checked again. Its an outside person who does all that-nothingto do with the airlines or airport.