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Measuring KH

     I have been using an electronic "pen" that I believe measures total 
dissolved solids in the water.  It gives a reading in ppm.  I use it to help me 
figure how much tap water to mix with my ro/di water.  I have been shooting for 
a measurement of around 120-180ppm.  I have just been assuming that this should 
give me around 6-9 KH and DH.  Am I making a dangerous assumption?  It is just 
so easy to dip the pen in the water vs. doing the hardness tests I have used in 
the past.

Trey in Tulsa, OK