My Salifert test kits ran out, so I bought a set of ELOS kits (alk, Ca, Mg). Tonight was the first time I tried to use the Calcium kit. The instructions say to fill the vial to the 5 ml mark with the syringe. Good idea, but the 5 ml mark is not 5 ml according to the syringe. It's 4 ml. I checked it with another syringe. So, I immediately have a question: Is the 5 ml mark on the vial the correct sample size or do I need an actual 5 ml, meaning the mark on the vial is wrong? 5 ml according to the syringe seems to give the best reading, but I'm in the process of raising calcium in one of my tanks and I currently have a Ca level in the high 300s. I hate when there are doubts like this, especially for something that should be straightforward.
Gary
Gary