I did a lot of research and my own experimentation with this about two months ago. I can tell you that if your red sea says 8.3 - 8.4 your PH
is actually about 7.8 - 7.9
The Red Sea along with many of the other PH
kits all have a margin of error for the higher numbers. This is mostly due to the fact that most people have a PH
much closer to 7.8 - 8.0 and when the test shows your 7.8 is 8.3, you are obliviously happy and continue to buy the test that gives you the numbers you like to see. I know it sounds strange, but its true. I compared red sea, marineland, and salifert to a pinpoint PH
meter calibrated with Pinpoint fluid and coralife fluid and found that red sea and marineland are very biased to the numbers you want to see. Salifert was dead on with the pinpoint fluid which is the 2nd highest level of quality for PH
fluid. I then did a calibration with coralife fluid, which doesn't even have a rating and found that the coralife fluid will calibrate so that your tank reads 8.2 - 8.4 even if it is at 7.8 - 7.9. All those test were done with PH
7 and PH
Anyhow, the quick and dirty is that if you are getting 8. anything with Red Sea and you drop in a pinpoint you are going to find that the numbers are way lower than that test is telling you. I advise on buying a digital monitor and calibrating with pinpoint solution, or buying salifert PH
, I keep meaning to write up all my notes but haven't done it, i'll get around to it one day.
One thing to say about the salifert kit though is that it is likely going to give you an in-between color. I use that kit to ensure my pinpoint is holding calibration, but there will still be some level of guess work in what your PH
actually is using a dye type kit. Finally before I have to call and wake you all up, make sure you take your PH
readings at the same time of day with a dye kit or else you'll never be able to track and already hard to track parameter. Best of luck!