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

Brand: Apogee Instruments

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. Choose 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