The Skyndex I SM1000A Digital Skinfold Caliper with the Durnin 4-Site formula was developed to use with the general population and is hands-down the fastest way to assess the body fat level of groups of people using body fat calipers. Ideal for Corporate Wellness, Health Fairs, General Exercisers. No need to input body weight. Simply select the age range and gender with one dial. This makes assessing Body Composition and Body Fat a 45 second job without the possibility of data entry errors! Skyndex body fat calipers are the best body fat calipers available.