Standard sized food scoops or ice cream scoops are used to serve specific-sized portions. Recipes for schools, restaurants and other commercial establishments refer to these standard scoops. The chart below shows the various scoop sizes and their equivalent measurements in terms of ounces.
You should note that the scoop size may vary (by tenth's of an ounce) from brand to brand.
Look for portion scoops in well-stocked kitchen shops or find them online. They can also be found in restaurant supply stores. We've listed some sources for your convenience.
Able Kitchen Supply - Restaurant and kitchen supplies
Chef's Tools - Retail kitchen supplies