Photosynthetically active radiation (PAR) is the radiation that drives photosynthesis and is typically defined as
total radiation across a range from 400 to 700 nm. PAR is often expressed as photosynthetic photon flux density
(PPFD): photon flux in units of micromoles per square meter per second (μmol·m-2s-1).

Specifications
•• Operation temperature: -40 ~ 70 ºC
•• Operation humidity: 0 ~ 100% RH
•• Sensitivity: 0.2 mV / μmol·m-2s-1
•• Calibration factor (Reciprocal of sensitivity): 5 μmol·m-2s-1 / mV
•• Non-linearity: < 1% (up to 4000 μmol·m-2s-1 / mV)
•• Non-stability (long-term drift): <2% per year
•• Spectral range: 410 ~ 655 nm
•• Repeatability: <0.5%
•• Diameter: 2.4 cm
•• Height: 2.8 cm
•• Cable length: 5 m