#$%^&*AU2011226874B220150618.pdf#####- 16ABSTRACT An apparatus, consisting of a rolling element, which is resting on a surface, and a force-sensing device, which is coupled to the surface. The force-sensing device is configured to make a first measurement indicative of a force exerted in a direction 5 perpendicular to the surface. The force is exerted by a force-sensing probe pressing against the rolling element so as to hold the rolling element stationary. The apparatus further includes a calibration processor, which is configured to collect the first measurement from the sensing device, to collect a second measurement indicative of the force from the force-sensing probe, and to calibrate the force-sensing probe based 10 on the first and second measurements. 15/09/11,19465 speci,161/3 Co9t Co N 00 A c * 04 Co CoY 00 CLf) CCN CN
