A device is used to send non-harmful electrical current through the body. Fat conducts electricity slower than muscle. Equations are applied.
Some problems with this approach include:
1. Different devices vary in quality and accuracy.
2. Skin conditions such as sweat ad dryness affect measurements.
3. Different body types can affect readings.
Formulas do not account for the above.
My third book, Pocket Guide to Fitness, is available on http://www.authorhouse.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories. These two books are on my Web site http://www.louizapatsis.com.