Why shouldn't you have one without the other? Many people use the ZM fogger (or other foggers) for either looks, or just adding some humidity, but don't need to be super specific. While it is nice to have the Hygrotherm, it is definitely not necessary. There is a dial on the ZM Fogger, so you can manually adjust them. If you have a humidity gauge in your terrarium, you can adjust based on that reading. It is definitely not necessary to have the Hygrotherm.![]()





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