Vaughn,

What you are saying then through your research is to do the following:

1) Get a good KH test kit
2) Estimate how much KH+ you may need for a certain solution to get let's say 4 degrees (I would think a larger solution would be more accurate)
3) Mix the above KH+ with RODI water.
4) Test the solution with the KH test kit
5) Adjust the KH solution either up or down (add KH+ or RODI water) to get closer to 4 degrees
6) Retest the KH reference solution
7) Repeat steps 5 and 6 if necessary.

Is this correct?