Active water testers need new colour charts for their water tests from time to time. JBL is now selling a replacement for the complete colour chart booklet, which contains brief instructions and colour charts for all the water tests. The great feature of the JBL colour charts is that the illustrated instructions mean you hardly need to spend any time studying the instructions.
Using the colour fields for the colour comparisons the tester will receive a message telling them whether the result is good or bad. When several evaluations of the results are required, in freshwater, saltwater or pond, there is a corresponding number of evaluation curves available.