recommended ph / kh test kit?
I've been using the 5 in 1 test strips for a while (before I went to pressurized CO2), and I'm afraid that my margin of error with them is far too high. pH on the strips is shown in shades of orange, and kh is shown in a shade of green. It seems that either the test kit resolution is poor, or my color vision is failing, because I can't tell the difference between 6.4 and 6.8 ph (quite a difference with calculated CO2 concentration). The kh is much easier to read, but I feel that the readings I'm using are less than precise do to my difficulties interpreting the colors. Does anyone recommend a specific brand or type of pH and or kh test? I have used the test tube pH tests plenty of times, and I find them almost as hard to read. I used to hear a lot about LaMotte, but I recall them being expensive for the initial kit, and not much cheaper for indicator refills. Your help is apprectiated!
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