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Hello All, I have been using the API Master Freshwater tests for a few months, but I have a heck of time with a few of the colours: the yellow in the ammonia, and the PH low and high. The colours that come up for PH appear so different from the colours on the tester sheet, especially at the top of the low range and the bottom of the high range. In terms of the ammonia, while my ammonia did not fit for any of the colours, it was yellow with no trace of green, but it didn't really match with the yellow at 0 or at .25. Does anyone have any advice on how to match these colours up to a tester or am I using a poor testing kit? If you have any ideas or suggestions, please let me know. Regards, Jeremy