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- Measure the light used for plant growth; PAR is a more valuable measurement than foot-candles as it measures only the light used by plants for photosynthesis.
- Measures photosynthetically active radiation (PAR) from 400 to 700 nm; calibrated to display PPFD
- Range; 0 to 2000 µmol·m-2·s-1, accurary of ±5%; Cosine correction is accurate to ±3% at 45°, and ±7% at 80°