You will need a hygrometer to measure the humidity in your grow room. Hygrometers often include a built-in thermometer, which is great because you need them both.

Learn all about climate for growing marijuana:

More climate related terms:

Climate | Air circulation | Airtight | Charcoal filter | Extractor | Fancontroller | Fans | Humidistat | Humidifier | Dehumidifier | Heating

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