The FatTrack II has a Super-Accurate Digital Measurement System with these great features: - Uses patented Floating Code Thickness Measuring System for 1mm accuracy and 100% repeatability. No more tables and charts to interpret. - Uses most popular trainer-recommended 3-site measurement system for men and women - upper, midsection, and lower body. Hand held caliper lets users measure body fat by themselves! - Incorporates sophisticated mathematical Jackson-Pollack body density equations for determining body fat. - Audible BEEP indicates correct pressure and measurement, ensuring accuracy. - Self-calibrating for lifetime accurate measurements. - Fitness rating indicator based on gender, age & body fat %. - Stores 3 personal profiles. - Statistical reports display-shows maximum and minimum readings at each measuring point.