This is a useful component when you want to allow other people to enter their own units.
It’s best used by pressing ‘Use This’ to import it into your space.
You can then add the number and units in the first box, the list of units in the second box, and the corresponding list of multiples in the third box, and it will then give you your number in the primary unit (the one which has the multiple of 1).
You can enter up to 2 units at any time. For example you could add units of both lb and oz, and then type “2lb 3oz” into the box. Spaces are always ignored.