Mark of Fitness blood pressure monitors feature the IQ System - Intelligent - Quick. The Mark of Fitness IQ System is a group of features that allow for rapid measurement of blood pressure without sacrificing accuracy. While accurately measuring blood pressure in about one half the time, the Mark of Fitness IQ System significantly improves user comfort by reducing the time normally required at higher cuff pressures. .Clinically proven accurate, 2-person, 30-time memory.