Designed for simple, accurate skinfold measurement. Spring-loaded levers provide a constant standard pressure of 10 grams/per square millimeter over the entire operating range. Easy-to-read scale measures up to 60 millimeter. Caliper is calibrated and uses the Durnin Formula.  Durable aluminum. Hard carry case and instructions included. Green. 2 pounds. Since 1986, Power Systems' passion for fitness has been fueled by our customers. Power Systems is committed to ensuring people have the tools to lead active lives with professional-grade products, cutting-edge educational materials, and elite customer service. “Power Your Potential” is the philosophy that guides everything Power Systems stands for.