What brand and type (liquid, strips, mixture) of testing kits do you recommend to those who are in the hobby? Do you find that there is one advantage over the other when testing with one versus the other? Many stores seem to only carry a handful selection of brands and types, although it seems as if there is no perfect solution that anyone can agree on, so let's hear your opinions and reasons why.
Honestly, I didn't know that there are kits for water testing. When I was a kid, my dad used to change the water, for every four days or so.