Apogee Instruments - S2-131 Red / Far-Red Sensor

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The Apogee S2-131 measures red (645-665 nm) and far-red (720-740 nm) to calculate the R:FR ratio that drives plant morphology, accurate under all light sources including LEDs. Choo se the output.Both versions share the same two-band detector; only the output differs.Available Options Analog output (S2-131-SS) SDI-12 digital output (S2-431-SS) Key Features Separate red and far-red channels for R:FR ratio Waterproof, cosine-corrected NIST-traceable, 4-year warranty Made in the USA and backed by Apogee's industry-leading warranty and support. Ideal Applications R:FR ratio monitoring under LEDs Photomorphology and crop steering Far-red supplementation studies Show more