Check the listing for details. Aviation Ground Support Headset Tester. Condition: New other (see details). Listed at 145.00 USD. This Aviation Ground Support Headset Tester will test ground support headsets, deicing headsets and any headsets with a single plug. It will also test all the David Clark 3000 series headsets.It will not test Military Headsets. It will also test extension cables. It includes a built-in Push-To-Test switch. Simply plug the headset into the tester. Then place the headset on your head and press the Push-To Test switch. This will power the headphone and microphone circuits. If a complete path of electric current exists, you will hear your voice in the headphone when you speak into the microphone. To test cables, plug in the cable to the tester and plug a known good headset into the other end of the cable, press the press-to-test switch, if a complete path of electric current exists, you will hear your voice in the headphone when you speak into the microphone.It will test regular 2 plug GA headsets with the adapter that is sold separate. This self-contained unit comes complete with one 9-volt battery, all in a strong, lightweight case with belt clip. Save time and money by testing your headsets before sending them in for repair. 1 Year warranty See my Headsets that I have for sale at my eBay Store http://stores.ebay.com/KC-Headsets