PAR Sensor

Product image for PAR Sensor
Product in use image for PAR Sensor
Product in use image for PAR Sensor
Product in use image for PAR Sensor

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.



  • 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
  • Resolution (LabQuest 2, LabQuest, LabQuest Mini, Go!Link, LabPro): 1 μmol m-2 s-1 (PPFD)
  • Sensor dimensions:
    • Diameter: 2.4 cm
    • Height: 2.75 cm
  • Materials: Anodized aluminum with case acrylic lens

Download the user manual for full specifications


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)

What’s Included

Sensor Requirements

The PAR Sensor requires a compatible interface and software to collect data. Interface and software sold separately. Getting started with probeware »

Compatible Interfaces

The PAR Sensor is compatible with these interfaces:

Software Requirements

The PAR Sensor requires data-collection software:

Ordering Information

All prices are for U.S. educators.

NameOrder CodePriceQuantity
PAR SensorPAR-BTA$189

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 »

Order Code PAR-BTA
U.S. Educator Price $189

Sample Data

Measuring PAR (photosynthetically active radiation) in a park
Measuring PAR (photosynthetically active radiation) in a park
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