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== Humidity and Temperature ==
There areis manya wide range of generic humidity and temperature sensors that are cheaply available. Some connect to a smartphone via Bluetooth and provide a graph of data while others incorporate a smallersmall LCD to display current readings.
== Light ==
== pH ==
When mixing concentrated liquid nutrients with water it's important to ensure the nutrient mix has the correct pH before applying to the cultivar so that it can make use of the nutrients. seeThere also:is no shortage of digital meters to choose from, however, many cheap digital meters are inaccurate and may drift over time. A digital meter should be recalibrated every few months depending on how heavy use is. The [[Growing_mediums|grow medium]] being used will determine the margin for error for the applied pH in regards to preventing [[Nutrients#Nutrient_lockout|nutrient lockout.]]
== References ==
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