Abstract: A device for testing performance of telephone headsets. The device performs reception, transmission, reception distortion, transmission distortion, reception limiting, and current consumption testing, as well as allowing these same tests with reverse polarity. The complete headset may be tested, or just the bottom or top units may be tested, as well as auxiliary power packs. The tester is designed to be used with any conventional headset, regardless of variations in the specifications, such as power supply. The tester may be programmed for an automatic testing mode.