Online Body Fat calcuator or fat calipers.
Fish have scales. Seals are much larger than fish and have a slippery body and a little face :)
They sell scales at Wal-Mart that come with it already. It show you weight and percent of body fat . I should be 29 percent or less to be fit.
The weighing scale tells you how much you weigh. Otherwise you are looking at a fish
scales can tell you how old a fish is by the number of rings on a scale
Often you can tell what family of fish it is in.
There are scales such as the The Escali Cibo Digital Nutritional Scale that are useful for diabetics. These scales tell the user the carbohydrate contents of foods. Some scales come with a book with an index of how much carbs, fats, and proteins are in a food.
"Scales show an estimate of your mass based on the force your body exerts on it; and to find out how much force your body is exerting on the scales, multiply by 9.8 (to convert kg into Newtons)." from http://www.mathsisfun.com/measure/weight-mass.html
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The same as your scales tell you.
Reptiles have scales on their back.
It doesn't matter about different scoring scales. You campare the percentages.