The Harpenden skinfold caliper is the most accurate, tested, prestigious, and scientifically advanced skinfold caliper in the world. Designed in 1958, the Harpenden Skinfold Caliper has been used on projects of international importance. It is the only caliper CE marked under the Medical Devices Directive 93/42/EEC for a Class 1 Device with Measuring Function and is calibrated using masters traceable to National Standards. SPECIFICATIONS:Weight (with case): 3 pounds (1.8 kilograms); Dial Graduation: 0.20 mm; Measuring Range: 0 mm to 80 mm; Measuring Pressure: 10 gms/mm2 (constant over range); Accuracy: 99.00 percent; Repeatability: 0.20 mm; Recommended by ISAK. BODYTRACKER SOFTWARE: With BodyTracker software you can monitor changes to body fat percentage, weight, and appearance. It is used by nutritionists, body builders, weight lifters, and for general fitness and weight loss. FEATURES: Upload and display digital pictures of yourself to track your progress; It makes calculations, records, and graphs of your body fat percentage and measurements; Calculates Body Mass Index (BMI) and Basal Metabolic Rate (BMR); Register an unlimited amount of users; Uses Jackson and Pollock 3, 4, or 7-site; Parillo or Durnim/Womersley formulasIt measures in pounds and inches, or metric; Use six body fat calculators to record body fat percentageRecord body tape measurements; Record your macronutrients; Record Blood Pressure; BMI and BMI Calculator; Graph all your results; One Rep Max Calculator. SPECIFICATIONS: System requirements: Windows; In English; Most recent software version