Tuner

Tuner may refer to someone or something which adjusts or configures a mechanical, electronic, or musical device.

Electronic

 * Antenna tuner, a device to adjust the resonance frequency of an antenna or transmission line
 * ATSC tuner, a device that receives digital television broadcasts
 * Tuner (radio), a module or device which separates out one channel from low-amplitude radio-frequency signals for further processing
 * TV tuner card, a device that allows reception of television on a computer
 * TV gateway, or network TV tuner, a device that receives digital television broadcasts and streams them over an IP network

Musical

 * Electronic tuner, a device used by musicians and technicians to measure the pitch of a musical instrument to adjust or correct the input signal to the desired pitch
 * Tuning mechanisms for stringed instruments, such as tuning pegs, tuning pins, tuning levers, & konso
 * Machine head, a flat handle for the worm gear on a string instrument upon which a string is wound
 * Tuner (band), an electronic rock duo consisting of Pat Mastelotto and Markus Reuter

Mechanical

 * Tuner (car), a customized car or hot-rod