Lange fat calipers are the simplest, most direct and accurate method for estimating body fat percentage. This constant tension fat caliper measures the thickness of skin folds, allowing one to quickly and accurately measure body fat. Lange fat calipers are trusted by fitness centers, personal trainers and healthcare providers worldwide. - Accurate to +/- one millimeter. - Tips pivot automatically for parallel measurement. - Easy to read scale measures skin folds up to 60 millimeters. - Low friction bearings on all critical pivot points. - Spring loaded levers provide a constant standard pressure of 10 grams per square millimeter. - Lange calipers come with an attractive hard shell carrying case, plus an instruction book. - One year warranty on defective parts.