Convenient, system for the advanced study of photosynthesis & respiration measurements in liquid-phase samples under illumination DW3 oxygen electrode chamber for larger sample volumes up to 20 ml Oxylab unit for direct PC control and data acquisition Sample mixing by integral stirrer driving a magnetic follower Illumination via LH362R red LED array via front optical port Quantitherm lighttemperature sensor for light calibration System calibration & control via Windows® Software