The FAS-DPD test would be very beneficial to you as it was for me.
I have some color blindness too but am very confident in reading the FAS-DPD test. It doesn't need comparison rather it starts out red or pink depending on FC level. The test water goes to clear after the appropriate amount of drops are added. Now I do have some trouble telling if the test water in the tube still has a slight hint of pink but with this method I am assured to get my FC correct within .5ppm.
Hope this helps. Good luck.
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