testing fc question

May 8, 2014
18
hope mills, nc
I know I need to shock to 20 but I have a taylor 2000 kit ( I purchased wrong one by accident and then purchased additional reagents separately so I have everything now ) however, my comparator only shows numbers/color chart 0-5 on it how do I know if I have reached 20? Maybe im missing something...im sorry but thanks so much, in advance.
 
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