Helmut,

You ask "could anybody explain to me how much would be an 1/8 " inch and for
stays
lbs. Maybe I know
tbs for tablespoons. Is this about on plastic fotobox or less or more"

1/8" is just over 3 mm and a pound (lb) is about 454 grams (presuming you
want a mass measure and not force).  A tablespoon is around 15 ml.  I don't
know what a plastic fotobox is.