I have a blue tang in a hospital QT at the moment treating with cupramine. I have a seachem Copper test but I am not sure how much I trust it. It is not exactly a "scientific measurement" of the reagent. The instructions tell you to stick a swirl stick in the reagent powder, tap off excess then stir in your test water. The part I am struggling with here is for example I read approx. 0.3 last night trying to keep at the target 0.5. I added 10 drops to try and bring it up to about 0.4-0.45. Today my reading is exactly the same as yesterday. Minimal evaporation, same procedure etc. Are all the copper test like this or is there one more like most other test where your reagent is measured scientifically in drops or mL? Which ones do you trust? I would really like to not under or over medicate.