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== Light Sensors ==
See [[Light#Measuring_light_intensity| Measuring light intensity]]
"Quantum" sensors are able to measure the intensity of a light source accurately but are very expensive. Alternatively, there is an ios only app called [https://korona.app/ Korona - Plant Light Meter] that can measure PPFD<ref>Korona whitepaper https://growlightmeter.com/whitepaper/</ref>
== Digital pH Meters ==
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