The Skyndex Skinfold Caliper with the 3-site Jackson-Pollock formula is a fast way to assess your athletes Body Composition and Body Fat. Simply select the age range and gender with one dial. This makes assessing Body Composition a 45 second job without the problem of data entry errors as with other types of skinfold calipers. Features Jackson-Pollock 3-Site formula, 1 dial to select Gender & Age, No data entry errors, Built in immediate %Fat calculation, 9v or 110v operation, Foam lined ABS plastic carrying case, calibration dowel and Power Plug included, 1 Year warranty included.