The pH of ocean surface water is normally 7.5 to 8.5 pH.

Over the years, however, the acidification tendency is to decrease 0.1 to 0.2 pH units/century. Acidification is a consequence of carbon dioxide (CO _₂ ) absorption in seawaters and oceans. Carbon dioxide reacts with seawater to produce Carbonic acid (H _₂ CO _₃ ).

pH modifications affect marine life growth, reproduction, and communication. Hydrogen ions have a tendency to bond with carbonate to form bicarbonate. The greater attraction to carbonate over calcium can adversely affect skeleton building and can limit coral growth.

• Ideal for aquariums and marine biology
• Easier to use and more accurate than chemical test kits
• Small size, big convenience

Four steps. One click. Instant Readout.

1. 'Zero' the Checker®HC with your vial & 10ml water sample inside

2. Take the vial out and add your reagent

3. Place your vial into your Checker®HC

4. Press the button and read the results