200GX Inductive Amplifier. Used in conjunction with any tone generator Inductive Amplifiers permit wire and cable identification without having to make direct metallic contact with the conductor. All models feature powerful speaker for noisy environments recessed on/off button control and high gain for accurate wire identification in congested cable bundles and equipment rooms. The 200EP also includes adjustable volume control for precise identification an LED for visual signal strength indication and recessed telephone test set connectors. The 200GX includes all the features of the 200EP in a new rugged ergonomically-designed housing.