There is really no comparison in resolution nor accuracy. Also, as Ben mentioned, the K-2006 uses a FAS-DPD chlorine test that does not bleach out at high chlorine levels the way the DPD test does and it is more accurate to within 0.2 ppm for a 25 ml sample size and can even read up to 50 ppm (using more DPD powder). The less expensive DPD chlorine test that is read visually only goes from 0-5 ppm with roughly 1 ppm accuracy though even that's a stretch.
I guess I'm challenging the notion that it's the resolution that makes a good kit necessary as it keeps being compared to the strips when as you have just explained quite simply it's the range that really matters in certain circumstances. I can see you would want a consistent resolution over that range. Thanks for putting it into a context I can more easily understand. I use a safety cover over the winter and change out at least half the water each season so do not have high CYA issues and don't mess around with copper thanks again to you and this forum

Glenn