ml is volume. G is weight.Simply weighed it comparing the number on the scale with the bottle (473 ml) and actual 438 ml. Lucas agreed the bottle should weigh more after they reviewed the pics I sent them. I'm not using grams but mililiters.The bottle packaging makes no reference to grams either.
You can’t weigh milliliters any more than you can weigh pints.
How many liters do you weigh?
Or does your scale measure in pints, too?