Vernier Software and Technology
Vernier Software & Technology

PAR Sensor

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


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.

Sample Data



  • 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
Download the user manual for full specifications

Experiments and Lab Ideas

Lab Ideas and Innovative Uses

Do you have an innovative use for Vernier technology? What about a favorite lab or demo? We love to hear what creative uses people have for our products. Please email them to

Free Experiments

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)

Compatibility Requirements

The PAR Sensor may require a compatible interface and software. Choose a platform below to see compatible interface and software options.

What’s Included

Ordering Information

All prices are for U.S. educators.

NameOrder CodePriceQuantity
PAR SensorPAR-BTA$223


Related Products

Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »

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