Check the listing for details. Accurate Quantum Sensor PAR Meter Full-Spectrum PPFD Tester Light Measurement. Condition: New. Listed at 91.79 USD. PAR meter is a must-have tool for all growers it measures Photo Synthetically Active Radiation (PAR) flux in wavelengths ranging from 400 to 700nm. There is a proportional relationship between the band and the number of photons absorbed in the 400 to 700nm band and the rate of photosynthesis in plants, which is important for horticulture studies and monitoring plant physiology. Features: Compact design, easy to use every day Large screen display User-friendly, easy to operate Record up to 100 measured values For real-time display, it shows the last four recorded data Hold function MAX / MIN / AVG Data With tripod socket Low battery indicator Auto turn off function after 3min of no usage Simple calibration function Specifications: PPFD (Photosynthetic Photon Flux Density) Measurement Range: 0~5000 μmol/m²/sec Repeatability: ±1 μmol/m²/sec Display Resolution: 0.01 μmol/m²/sec (0~99.99); 0.1 μmol/m²/sec (100~999); 1 μmol/m²/sec (1000~5000) Measuring rate: 1 measurement per second Cut-On Wavelength: 400±10nm Cut-off Wavelength: 700±10nm Power Requirements: 2 x 1.5V AAA alkaline battery Dimension: 115 x 60 x 24mm Weight: approx. 115gms (without batteries)