I need some help please, I have 2 red sea alkalinity test kits. One kit is the pro kit and the other is the regular marine kit. The alk test in the marine kit is giving me a result of 9.5 and the pro kit is giving me a result of 7. Im starting to dose and I'm not sure which one to go with. I tried each kit multiple times and getting the same results. The marine kit you count the drops and the pro kit you see how much titration was used from the syringe also going by the last ring on the plunger and not the actual titration level. Does anyone have any idea why the results are so different?