An improved probe includes a conductive tubular housing or body containing a coil spring and a conductive plunger movable in the housing and having a contact tip outwardly extending from one end of the housing. The plunger and tip are urged to a normally outward position by the bias force of the spring....http://www.google.es/patents/US6570399?utm_source=gb-gplus-sharePatente US6570399 - Test probe and separable mating connector assembly
Test probe and separable mating connector assembly
