Amplitude T-Series wireless audiometer for primary care or specialty physicians, audiologists and on-the-go hearing health professionals. Amplitude T-Series contain all the electronics within the handheld patient response switch, and communicate with a Windows PC by wireless technology. Amplitude T3 performs air and bone conduction testing. Amplitude T4 is the air conduction testing model. Each can be used with a variety of headset transducers. T-Series provide both manual and automated test mod