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Our products compliment your teaching and help your students engage with key STEM concepts.

Educational Standards

Our products support provincial requirements for NGSS, AP, and more.

Go Direct® PAR (Photosynthetically Active Radiation)

The Go Direct PAR (Photosynthetically Active Radiation) Sensor measures photosynthetic light levels in both air and water. This probe connects via Bluetooth® wireless technology or via USB to your device.


The Go Direct PAR 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. 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.

Rechargeable Battery—Ready When You Are

The robust rechargeable battery offers long battery life and provides always-ready operation when using the sensor wirelessly. Monitor battery life directly from our award-winning Vernier Graphical Analysis® app, as well as LabQuest® 3. Should the battery run low, simply connect the sensor to the charging cable and keep on collecting—no interruptions or inconvenience to you or your students.

Wireless or Wired—The Flexibility to Choose

Our Go Direct sensors connect directly to your mobile device, Chromebook, or computer using our Vernier Graphical Analysis® app—no additional equipment or software purchases are necessary. Go Direct sensors can be used wired via USB or wirelessly via Bluetooth® wireless technology, allowing you to choose the solution best for your classroom or laboratory.

  • PAR Range: 0 to 2500 μmol m-2 s-1PPFD) in full sun
  • Absolute Accuracy: ±5%
  • Repeatability: ±1%
  • Long-Term Drift: Less than 3% per year
  • Cosine Response:
    • 45° zenith angle: ±2%
    • 75° zenith angle: ±5%
  • Wavelength range: 375 nm to 650 nm
  • Typical Resolution: 1 μmol m-2 s-1 (PPFD)
  • Sensor dimensions:
    • Diameter: 2.4 cm
    • Height: 3.3 cm
    • Cable Length: 5 m
  • Materials: Anodized aluminum with cast acrylic lens
  • Go Direct® PAR (Photosynthetically Active Radiation)
  • PAR Sensor lens cover
  • Micro USB Cable

User Manual:

Warranty: 5-year limited warranty (1 year on battery)