You can use it to grow and charge any item you own, even items without fields, it will grow the inherent field that makes the item what it is.
Items with fields can also be grown on it, once started, it will continue strengthening/growing it for for one hour.
Be careful with how much you boost/grow and item, because it can become un- use-able.
The word to activate it is “charge” or “begin charging”.
