The Body Caliper is a perfect caliper for trainers, advanced users, researchers, and those that prefer testing with their personal favorite formulas. A caliper must render identical pressure at every reading to produce reliably comparable information. In a University of New Mexico research comparison study sponsored by the American College of Sports Medicine to evaluate accuracy ranges for their members, the Body Caliper compared favorably to the Harpenden™ and Lang™ calipers each costing hundreds of dollars. The Body Caliper's accuracy is accomplished through its precicion engineering and patented AccuSpring™ which exerts 10 grams of pressure per square millimeter of skin (10 gr./mm2) during the full duration of any skinfold measurement. Consistency and accuracy together guarantee research level reproducibility for highly reliable readings over time.  The Body Caliper comes in a fitted case with an illustrated instruction manual (including measurement charts for 4-site measurements).