If you need a method that's fast, error free, accurate and easy-to-use, we recommend and use the Skyndex Electronic Body Fat Calipers. This is basically the same as the Skyndex I except it does not have the built-in computer. It has an easy-to-read digital readout and a "hold" feature. When the user is satisfied with the reading, the hold button can be pushed and this will lock the reading on the digital display until it can be written down. A second push on the hold button returns the caliper to "0".