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The Apogee Instruments MQ-500 Full Spectrum Quantum Meter, Accurate for All Light Sources Including LED, Lightweight, Waterproof Sensor, Long Warranty. Made in Logan Utah by Apogee.: Amazon.com: Industrial & Scientific
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Quantum PAR Meter - High Precision, Grow Light meter, Indoor Plants meter, Good for Growing droseras and All Indoor Plants,Rechargeable: Camera & Photo - Amazon.com
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