Medical & Relaxation devices - For the relieve of cramps or pain. For the individual well-being: massage etc. They use electric impulses or electromagnetic fields.
Environmental measuring devices - For electromagnetic fields, radioactivity, light temperature/intensity etc. They may also work with biosensors for soil or water samples.
Detection and shielding devices - For the increase of personal safety and privacy. They reduce the risk data theft and help maintain anonymity where appropriate.