The Contour Comparator Chlorine Test Kit measures total chlorine from 0 – 250 ppm.  Its simple and easy to use and comes complete with all the necessary reagent tablets.  2 test tube samples of water are taken from the made up solution; 2 reagent tablets are crushed into tone of the test tubes and inserted into the kit.   The other test tube is also inserted. The reading of the coloured solution can be readily compared to the reference disk in the machine and the solution adjusted accordingly or discarded.