The present invention relates to spring conductors used within modular jack assemblies. The spring conductors electrically connect with conductors residing on a multi-connector plug to connect communication equipment, digital or audio, to a transmission line. The spring conductors maintain connection with the conductors on the plug by a spring force inherent in the spring conductor. The present invention measures this spring force with a probe inserted into the modular jack assembly. The output of the probe being proportional to the spring force.