My husband bought me a nice digital kitchen scale. I can put an empty plate or bowl on it and set it to zero before weighing my food, so I don’t have to dirty another container. It can be set for ounces or grams with one touch.
I was surprised to see that the amount that I thought was one once (one cup) of cereal was actually 2 OUNCES! On the other hand, I was shorting myself on cooked chicken breast because it looked like more than I thought. Since most package labels give a serving size in grams, even if they also give you the approximate equivalent in ounces or cups.
Now I don’t have to pull out the measuring cups and spoons all the time.