Using a high-quality professional tool called a caliper, a trained tester
typically measures body fat at 3 to 9 sites on the body. The tester first
pinches the skin and the fat that lies under the skin and pulls the skin and
fat away from the muscle. The tester then places the caliper
1 cm (0.4 in.) above or below
the pinch and reads the measurement from the caliper dial. Usually about two or
three measurements are taken at each site.
Body fat measurements
can vary depending on who takes the measurement. To see if your body fat level
has changed, it's best to get measured by the same person.