In your example I would first convert 150g into ounces using an online conversion website, then I would place my cup on my scales, tare to zero, then add in the milk until you get your desired weight (as in the converted from grams to ounces number) in ounces up on your scale.
Although, I must say it is really weird to weigh your milk! You sure its not mL (milliliters)? Conversion sites also convert mls to fluid ounces or whatever volume measurement you desire.
HTH.
Although, I must say it is really weird to weigh your milk! You sure its not mL (milliliters)? Conversion sites also convert mls to fluid ounces or whatever volume measurement you desire.
It's not that weird... even with liquids it's more accurate to weigh than it is to measure by volume. I weigh EVERYTHING (milk, water, juice, eggs, etc) for my recipes, with the exception of ingredients only needed in small (teaspoon/tablespoon, etc) measurements.
Although, I must say it is really weird to weigh your milk! You sure its not mL (milliliters)? Conversion sites also convert mls to fluid ounces or whatever volume measurement you desire.
It's not that weird... even with liquids it's more accurate to weigh than it is to measure by volume. I weigh EVERYTHING (milk, water, juice, eggs, etc) for my recipes, with the exception of ingredients only needed in small (teaspoon/tablespoon, etc) measurements.
Okay, well its UNUSUAL then to see a recipe calling for "150 grams of milk" 
My recipes would all state 150mLs milk OR 2/3 cup of milk. FWIW, I too, also prefer an accurate millilitre measurement to cup measurements, and I always weigh flour, sugar etc.
With metric, the only thing where 150mL precisely equals 150grams is water. 150mL of oil, for instance, would weigh less than 150grams.
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