KO - Kemler & UN provides a useful tool for quick search of Kemler numbers and UN numbers with a database containing more than 2,000 different substances.

-The search is very simple, a simple list is not provided, but the possibility to search for the substance by simply entering the corresponding number, the rest will be all automatic
- There are no advertisements
-There is a session with all the most popular similar rhomboid signs
-This application is classified in PEGI 3, nevertheless the manufacturer recommends its use to a conscious and adult public