Why I love the metric system.
Needing to mix 300 ml in total, consisting of 150 ml of auto transmission fluid & 150 ml of acetone but I don't have a small enough graduated measure. So I used my electronic kitchen scale with an unmarked pouring cup. Set the tare to zero, add 150 grams of water & mark the level with a pen. I now have a pouring cup with a 150 ml measure marked on it.