[APD] reliable & accurate KH test kit

[revance at indiana_edu]

Does anyone know of a good KH test kit that is accurate and easy to read? I am 
setting up a new tank and am going to use a pH controller w/ CO2 injection. 
Thus by keeping my KH stable at a given value I can easily keep my CO2 levels 
right where I want them. I would really like to find a test kit that will 
allow me to measure the KH within 5ppm, but I don't know if anything like this 
exists. I have a crappy test that measures in something like 40ppm 
increments... real accurate! Thanks for any input.
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