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Enabling better global research outcomes in soil, plant & environmental monitoring.

MQ-303 3 Sensor PAR Meter

Apogee line quantum sensors measure a spatial average of photosynthetically active radiation. The MQ-303 has a separate sensor bar with 3 sensors while the handheld meter displays and stores measurements. The sensor housing design features an integrated bubble level and is fully potted making the sensor weatherproof. Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the wavelength range from 400 to 700 nanometers and is strongly correlated with plant growth. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to ensure optimal specimen health.

• Next generation sensor head design
• Excellent cosine response
• Self cleaning dome shaped head
• Sensors are potted solid for extreme conditions
• Also available in multi sensor “line quantum” models for spatially averaged measurements
• Four year warranty
Calibration Uncertainty: ± 5%
Measurement Repeatability: < 1%
Non-stability (Long-term Drift): < 2% per year
Non-linearity: < 1% (up to 3000 µmol m-2 s-1 )
Response Time: < 1 ms
Field of View: 180°
Spectral Range: 409 nm to 659 nm (wavelengths where response is greater than 50 % of maximum)
Directional (Cosine) Response: 0.06 ± 0.06% per °C
Temperature Response: ± 5% at 75° zenith angle
Operating Environment: 0 to 50°C, < 90% non-condensing relative humidity up to 30°C, < 70% non-condensing relative humidity from 30 to 50°C, Separate sensors can be submerged in water up to depths of 30m
Meter Dimensions: 12.6cm length, 7.0cm width, 2.4cm height
Sensor Dimensions: 50cm length, 1.5cm width, 1.5cm height
Mass: 300 g
Cable: 2m of shielded, twisted-pair wire. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions)
Warranty: 1 year
Material Stainless Steel
Line quantum meters, MQ-300 series, provide spatially averaged PPF measurements. All sensors along the length of the line are connected in parallel, and as a result, Apogee line quantum meters display PPF values that are averaged from the location of the individual sensors.