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Even the slightest change in humidity or temperature can effect a plants growth cycle and cause stress to your plants and in extreme cases kill your crop. Having a thermometer and hygrometer in your grow space, allows you to monitor this data and act accordingly should it drop out of the plants environmental needs for the particular cycle it is in.
Every grow space needs this little bit of kit, it can be one of the cheapest things you will buy for your grow space but it is essential for a plants life support, any seed sawn in a room without these is destined for doom.
Without knowing what your temperature and humidity are doing, it can lead to a lot of head scratching if you’re trying to fix a problem with the plants. All of our thermometers/hygrometers are easy to use and easy to mount.