Ok, I thought I will provide some results from talking to LaMotte. As mentioned before, they responded quite quickly and after a few emails they sent me a sample of water with the exact measurements written on the bottle. I performed the tests and - YES, I read the tips & tricks, ensured that the tubes were dry from the outside, and and and . However, my results where still off - quite a bit.
I sent in the results I got and the answer was that the water was in transit for some time and according to this the deviations are "normal." I am still not happy with the ColorQ Pro7 and when comparing my measurements with the values written on the bottle, I am out of range with Alkalinity, Hardness is off, and PH is lower. In summary, I must say that the test-kit is useless for me. I will probably get the K-2006 and sell the ColorQ Pro7 (anybody interested? Only used for less then 10 tests ;-).
Hope this will be helpful for people that are also looking for a "test kit."
Thanks
Surfix007