The SKYNDEX I SM1000E Digital Skinfold Caliper with the Slaughter-Lohman 2-Site formula was developed to use with children 8-18 years of age and is hands-down the fastest way to assess your class or youth sports team's Body Composition. Simply select the gender with one dial. There are 2 dial settings on this caliper; 1 for Male, 2 for Female. This makes assessing Body Composition a 30 second job without the problem of data entry errors!