Abstract: Generally speaking, the present invention contemplates a module test set in a carry-about case having on the outer side of the case lamps indicating the tip and ring sides and an alarm lamp. The case outer side also has a five prong plug to receive a module for testing and a test switch. The test set is operated by a circuit including a power line plug, an on-off switch, a transformer, tip, alarm, and ring lamp circuits, a module prong receiving receptacle connected to the tip, alarm and ring lamps and a test switch connected to the lamp circuits.