ABSTRACT
Abstract Today a high precision of t e s t i n g i s more important than i n former years: Production has become more uniform, the actual product quality should exceed requirements only as much as necessary for economical reasons, but because of the new l e g a l regulations concerning product l i a b i l i t y , i t should never f a i l to pass. On the other side, with the increasing i n t e r n a t i o n a l trade more laboratories and d i f f e r e n t countries are concerned, making i t more d i f f i c u l t than ever to keep the p r e c i s i o n of t e s t i n g at a high l e v e l .
