Hello, 4A friends-- I resumed CO2 supply to my 50 g planted tank from my Cylinder and Griggs Reactor. Now I think I should do more periodic monitoring of the pH, bc I had an incident in the past where my son-in-law while installing a GFCI electrical outlet, accidentally moved the needle on the cylinder gassing the tank which led to deaths of my beloved SAEs,(most other finny friends survived). I looked up on this forum and could find no guidance on selection of a reliable pH meter. So I looked at the Planted Tank forum and there I discovered a preference for the PinPoint meter(s). Does anyone in our club know about these? Does anyone have one that you would like to sell? Thanks for any information or offers!