salinity solution

I used the tester a few times and, with proper care and calibration, it works great. However, I was given a hydrometer as a gift and have switched to using that so no longer need the digital tester. This also comes with about 25 salinity calibration solutions.

So I just purchased the new Hanna Marine Monitor that has a PH probe and a Salinity/Temp probe. The unit continuously displays the above and uses temp to accurately calculate it’s readings. I hooked the unit up and followed the instructions on how to use the included 7.1 ph solution satchets and...