National Health and Nutrition Examination Survey

1999-2001 Measuring Guides

Model Name: Concentric Circles

concentric circles graphic

Hard disk set (HD) and floppy disk set (FD)

Product Information
Model Manufacturer
HD Custom Made
FD Custom Made


Model Diameter (inch)
HD 2, 2.5, 3, 3.5, 4, 5, 6
FD 5, 6, 7, 8, 9

The hard disc set comprises seven white plastic circles. The floppy disc set comprises five brown vinyl fabric circles. The diameters of these circles are specified as above.

The circles are used to help estimate the diameter of round foods such as cookies, pancakes, biscuits, pies, and tortillas.