| Seachem reef status calcium test
This was the last of my test kits that I switched over to seachem. As you may or may not know seachem tests come with a reference sample that you can test to insure accuracy. My calcium reference sample is 474 ppm, I tested it upon receiving the kit and got 475 ppm (it clearly registers in 5 ppm intervals, which is awesome). I am extremely happy with the calcium kit as well as all other seachem testing products, I definately recommend it. | 
