Submersible FL 3500/SM Photon Systems Instruments Categories Crops , Photosynthesis, Chlorophyll & Respiration Brochure Send Enquiry Overview PSI Submersible FL 3500/SM is underwater experiments Maximum operating depth of the instrument is ca 1 meter. The measuring compartment is equipped with a practical holder. Typical samples: Plants, corals and seaweed. Back Our Related Products Photon Systems Instruments Gas Mixing System GMS 150 Learn More Photon Systems Instruments PSI Thermoregulator TR 2000 Learn More Hansatech Instruments FMS-300 Pulse Amplitude Modulated (PAM) Fluorometer Learn More PP Systems WMA-5 CO2 Gas Analyzer Learn More