There are five grades, and as a rule the darker the color, the stronger the maple flavor. Flavor is specific yet much more difficult to judge. Someone with an experienced maple palate carefully tests the flavor. The state of Vermont is known for its strict guidelines and Coombs Vermont Gourmet's syrup is tested frequently by the State. In addition, Arnold Coombs randomly tests his syrup frequently.
Maple is a natural sweetener with great versatility.
Each grade has its virtues. Besides using it on pancakes, waffles, granola, and ice cream, it can be used in baking or even added to marinades and dressings. Every gallon must weigh 11 pounds regardless of the grade. All syrup producing governments use this weight standard. All grades must meet density standards because low density syrup will ferment, while high density syrup leads to the formation of sugar crystals and eventually could turn to rock candy.