The OX1LP Dissolved Oxygen Packages are based on the use of polarographic dissolved oxygen electrodes and may be used to measure photosynthesis and/or respiration in the aqueous phase, using suspensions of plant cells, animals, organelles (chloroplasts and mitochondria) and algae. These packages may also be used to monitor chemical and biochemical reactions that either produce or consume O2 in the aqueous phase. The Dissolved Oxygen Package comes complete with all of the instruments, accessories, software, data acquisition interface and manuals for the instructor and the student.