Apogee MQ-200 PAR Meter
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Apogee quantum sensors measure photosynthetically active radiation. The MQ-200 features a handheld meter to display and store measurements with a separate sensor head connected by a lead. The sensor head features a fully potted, domed-shaped design making it fully waterproof, weatherproof and self-cleaning. The head can be held by hand, mounted to a leveling plate, or attached to an optional sensor wand for taking measurements in hard to reach places. Photosynthetically active radiation (PAR), or photosynthetic photon flux (PPF), is the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. Gardeners, greenhouse managers, growth chamber users and salt-water aquarists measure PAR to ensure optimal specimen health.

Cosine Response: 45° zenith angle: ± 1%, 75° zenith angle: ± 5% Spectral Range: 409 to 659nm Accuracy: ± 5% Uniformity: ± 3% Repeatability: ± 1% Output: Integrated meter, 0 to 2999 µmol m-2 s-1 Responsivity: N/A Calibration Factor: N/A Electric or Sun Calibration: Electric and Sun Response Time: Less than 1 second Field of View: 180° Long-Term Drift: Less than 2% per year Number of Sensors: 1 Length of Sensor Bar: N/A Power Requirement: 3 V coin cell battery (included) Operating Environment: 0 to 50° C Sensor Submersible: Sensor: Yes, Meter: No Mass: 180 g Warranty: 1 year