Radionics (also known as psychotronics) is a field of fringe science which explores the use of devices which manipulate radiative energies which can affect living systems at a distance.  Many believe radionics operate using subtle energy and technologically augmented ESP, while others (including its founder, Dr. Albert Abrams) believe it to operate using electromagnetic fields.
The original devices worked on the principle that living systems responded to particular frequencies of electromagnetic radiation; applying the right frequency for a disease would theoretically cause it to vibrate to the point of destruction, like a wine glass shattering for an opera singer. Modern radionics machines are also used for diagnosis and operate remotely with a taglock called a witness sample (innovations credited to Dr. Ruth Drown), though they typically retain the notion of vibration from the originals.
Most radionics devices are some variation of variable resistors for tuning, a witness area (generally a metal plate, coil, or well) for holding the witness sample, and a stick pad (also known as a rubbing plate), a type of divination tool utilizing something akin to the ideomotor effect used to tune the device. To use a stick pad, the practitioner must slowly rub the surface with any fingers they feel comfortable using while slowly turning the tuning knobs until they feel their fingers "stick", a reaction that differs slightly between each individual. It's reported that pendulums can be used instead of rubbing.