A method of measuring a metric of a measurement area of interest on a subject comprises contacting a part of the subject on a rest of a measurement apparatus that comprises an arm, a base attached to or formed on the arm, and a displacement sensor attached to the arm; adjusting the measurement apparatus...http://www.google.es/patents/US8014003?utm_source=gb-gplus-sharePatente US8014003 - Body metric differential measurement device
