pH of ocean surface water is normally 7.5.to 8.5 pH. Over the years however, acidification tendency is to decrease 0.1 to 0.2 pH units/century. Acidification is a consequence of carbon dioxide (CO₂) absorption in seawaters...

The HI-97105C Hanna Marine Master Photometer provides a multiparameter solution for accurately measuring the water in saltwater aquariums. This fish tank photometer measures vital parameters that provide insight into the quality of water, which is...

The HI-97105 is designed to accurately determine pH, Alkalinity, Calcium, Nitrate, Nitrite, and Phosphate levels in aquariums and marine biology applications.  Alkalinity, Calcium, Nitrate, Nitrite, pH, Phosphate   The HI-97105 Marine Master Photometer combines accuracy...

Testing and monitoring salinity in saltwater aquariums is an ongoing task. The HI-981520 Marine Monitor is the ideal solution for aquarists looking to continuously monitor salinity levels in aquariums, seawater, or aquaculture.  pH  Temperature  Salinity...