Measurements of algal photosynthesis can be made with our FL23 Algal CO2 Package as CO2 exchange in the head space of an algal chamber. Changes in dissolved O2 in algal liquid suspension can be made with our OX1LP dissolved O2 systems. Study algal photosynthesis by measuring changes in chlorophyll fluorescence with small hand-held AquaPen or as part of the photobioreactor cultivation and monitoring systems. Chlorophyll Fluorescence imaging of algal cultures on plates may be done with the FluorCam systems. Coral photosynthesis may be measures with the diver-portable CISME system.