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http://www.growingexposed.com How do you test your minimum and maximum temperature and humidity when you're not in your grow room? The answer is simple: a min-max hygro thermometer! In order to gather the most accurate information, it is important to know where to hang your Min-max. Hanging on the wall provides inaccurate reading results, so the best place to put it is directly at the level of the plant canopy; not below it, not above it, not on the wall. The reason for this is because it gives you the exact readings you want to know. Any fluctuations in humidity or temperature, you'll know.