I’m looking for some input on testing water. I ordered a few weeks ago my usual API master test kit and am using it as normal, but I seem to be having some problems with my water and took samples to my lfs and they said my water is perfect and that a drop type test kit is unreliable and that it is my test kit that is the problem not my water. Well this pisses me off about as much a thermometers do ( I can't seem to find one that is accurate). or heaters (why is it no one can make a reliable heater?) I've been doing this 30+ years, technology has advanced so much since I started keeping fish but the aquarium industry is still in the dark ages. My question for the group is have you found any testing equipment the you can really trust.