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 SpectraPen SP 110 Learn More Spectrum Technologies LightScout Red/Far Red Meter Learn More Photon Systems Instruments PAR-FluorPen FP 110-MAX-LM Learn More Spectrum Technologies LightScout Silicon Pyranometer Learn More