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Product Review: Apogee Instruments' MQ-500 Quantum Meter with Notes on Why Measuring Light Intensity is Important
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Amazon.com: Apogee Instruments MQ-500 Full-Spectrum Quantum PAR Meter - Digital PPFD Meter for Indoor Grow Lights, Sunlight & Plant Monitoring : Patio, Lawn & Garden
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Apogee MQ510 Is The First Truly Underwater PAR Meter For Hobbyists | Reef Builders | The Reef and Saltwater Aquarium Blog
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