Abstract: A line test apparatus includes a hand-held body having a sensor probe tip for capacitively or inductively sensing the presence of an audio signal within a conductor under test, or within a conductor pair under test. The probe tip delivers an electrical input signal to an amplifier housed within such body; the electrical amplifier serves to amplify the signal and produces an amplified electrical output signal at an output terminal thereof. A vibratory element is electrically coupled to the output terminal of the amplifier for vibrating with an intensity corresponding to the magnitude of the sensed audio signal. Other output transducers, such as LEDs and/or a loudspeaker, may also be included for providing visual and/or audible output signals indicating the presence and magnitude of the sensed audio signal.