Interpreting OTO results by color

[Watermom]

Here is a visual matching colors of OTO results to approximate chlorine readings.

https://lh6.googleusercontent.com/-tq13B9mOkQ8/U0b_GIcHvjI/AAAAAAAAG04/sx8Yadz6s6E/s389/OTO-rev%252001.jpg

[Tom.B]

Is there a reason to have an OTO kit when you already have a K2006C?