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PAR Sensor

The PAR (Photosynthetically Active Radiation) Sensor measures photosynthetic light levels in both air and water.

SKU: PAR-BTA Categories: ,


The PAR (Photosynthetically Active Radiation) Sensor reports the Photosynthetic Photon Flux Density (PPFD), which corresponds to micromoles of photons per meter squared per second (μmol m-2 s-1). This is the power of electromagnetic radiation in the spectral range that is used by plants for photosynthesis (400–700 nm). It features a waterproof sensor head and can be used to measure PPFD from sunlight and electric light sources. This sensor is ideal for experiments investigating photosynthesis and primary productivity and can be used in many agricultural and environmental science applications.

  • PAR Range: 0 to 2000 μmol m-2 s-1 (PPFD) in full sun
  • Absolute Accuracy: ±5%
  • Repeatability: ±1%
  • Long-Term Drift: Less than 2% per year
  • Cosine Response:
    • 45° zenith angle: ±2%
    • 75° zenith angle: ±5%
  • Wavelength range: 410 nm to 655 nm
  • Typical Resolution: 1 μmol m-2 s-1 (PPFD)
  • Sensor dimensions:
    • Diameter: 2.4 cm
    • Height: 2.75 cm
    • Cable length: 6 m
  • Materials: Anodized aluminum with case acrylic lens

User Manual:
Warranty: 5-year limited warranty

Download free experiments for the PAR sensor. Student instructions and teacher information are included.

  1. PAR Attenuation in Water
  2. Photosynthesis and Respiration
  3. Photosynthesis and Respiration (Inquiry)