The product itself is relatively satisfactory, but it is unacceptable that the instruction manual is only available in German and that the supplier says unable to provide in French or English. It offers a compensation of 7 but this proposal is an insult to the consumer: it is not provided by law that all products sold in France must be accompanied by a manual in French? do 7 will help find a manual USE The development is difficult because the whole is not very stable, it would take a heavier, more stable base and the set more rigid, which would at least put a flickering dot. The improved product and could provide better services. Ph. D. (Dr. Science)