yes fastest is the brand. it has a clear plastic color chip that is placed next to the vial. Its alot easier to tell vs a colored piece of paper. Also if your going for reef aplication salifert brand has a positive color change for Alk, Calcium, and Stronium. I would most likely stick with the fastest. Its easy, quick and painless therefore you are more likely to test your water more frequently. I have salifert if I were to test all my water parameters at once the chemical bottles would take up the entire kitchen table. After you learn how your parameter work you could phase out some test kits such as amonia and nitrite even nitrate if your levels stay very very low with a DSB or refigium. But still have them at hand incase you notice something funking going on in your tank.
