a micro scale includes one substrate forming a first zone constituting a first terminal , one conducting vibrating beam which has two opposite ends affixed on two supporting areas on the substrate , the conductive beam forming a second terminal ; wherein the conductive beam is made of polymer gel having metallic microparticles in low quantity so as to avoid any contamination of a biological material to measure , the density of the metallic microparticles being high enough to achieve electrical conduction of the second terminal . a manufacturing process of such a micro scale circuit is also provided .