I try to keep glass carried on board to a minimum. Usually that means only bottles of wine and beer which are stowed well. Broken glass is a hazard on a rocking and rolling boat. So when it comes to measuring in the galley area I have found plastic measuring cups are a perfect fit when cooking up a meal or mixing up some Boat Drinks. I've been using two Evercoat epoxy mixing cups for years now. They are durable won't shatter like glass and are perfect for use in the galley. I have them labeled with a Brother P Touch labels for galley use only:
Just so they are not accidentally used elsewhere on board for mixing cleaning products etc... They are also very useful because they not only have calibrations in ounces but, also milliliters and cc's too. If you have recipes that call for those measurements:
I use two in the galley area so I can use one for measuring dry ingredients and the other for wet ones. Such as when one is cooking up some rice for a meal:
Also because they don't have handles the cups stack inside one another:
This helps save space and on most sailboats saving space is a real good thing!