The CL-105/106 provides a convenient means of testing the electromagnetic shielding effectiveness at the enclosures most likely points of degradation the seams doors and filter connections. The system consists of a transmitter receiver antenna probe a flex antenna extension headphones and a durable carrying case. The improved sensitivity of the receiver allows it to meet the most rigid MIL standards for shielded room acceptance. The rugged construction yet sleek appearance allows it to be used under the most adverse conditions. The ability to replace the antenna probe shield when worn is another one of its features.