Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. The Figure Finder Fat-O-Meter? has proved itself through the years as a leader in the very competitive skinfold caliper market * It is spring loaded * It has been thoroughly researched * It comes with complete instructions * It is easy-to-use * It is not bulky * It has stood the test of time * The instructions are current * A great caliper for use in fitness programs, clinical screening programs and home applications * Has 50mm scale imprinted directly on caliper arm *