What was started by Jan Friedrich Toennies almost 60 years ago with the epoch-making invention of the differential amplifier and the development of the first (directly recording) EEG instrument has been logically and consistently sophisticated, resulting in the most advanced generation of TOENNIES instruments. In TOENNIES, innovative researchers of renowned hospitals and institutes have always found a competent partner to help them make reliable diagnoses. This relationship has remained unchanged ever since TOENNIES became a division of Erich JAEGER GmbH in 1987 and a part of VIASYS Healthcare in 2001. TOENNIES now offers diagnostic systems for clinical electrophysiology in neurology for testing of electromyography, nerve conduction studies, and evoked potentials. There is also a well renowned line of products for neuroophthalmology--with the examination of electroretinography and electrooculography. All instruments can be connected to a local area network, and this network can be connected to a hospital information system with modern communication protocols like HL7.

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