Indeed, Lamotte test kits are the best, but are extremely expensive. We don't really need that kind of accuracy, but they are nice to have.i heard Lamotte are the most accurate. I use API freshwater as I got it on sale.
+1. Test strips are notoriously prone to poor storage conditions.Test strips are inaccurate.
My Nutrafin GH kit tends to have very low color intensity when testing soft water... Sometimes you can only tell by looking down the test tube from the top against a white background.Isn't it just blue and yellow?
gH and kH test kits work by titration, so there should only be two colours...