Test Kits - Who makes the best?

[TrailFish]

I've used plenty of test kits over the years and always question their accuracy as well. I started using the Seachem test kits recently and the ones I've used come with a reference value. It make it a little easier to guage the colour especially if you put the reference value beside the tank sample.

Overall, test kits are a pain in the #@%!! A necessary evil.