Tuner
A tuner is an adjustable device which passes one radio frequency, or band of frequencies, and excludes others, by using electrical resonance. The simplest tuner consists of an inductor and capacitor. Combined with a detector, also known as a demodulator, it becomes the simplest radio receiver, often called a crystal set.
A tuner is also a device to adjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies.
A tuner is also a radio receiver without an amplifier or loudspeaker, which is often constructed for superior audio quality in high fidelity applications, as in FM Tuner."
A tuner is also a professional who adjusts the pitch of musical string instruments such as pianos using a tuning fork, or a frequency counter electronic device using a quartz crystal, as a frequency reference..
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A tuner is also a professional who adjusts the pitch of musical string instruments such as pianos. Electronic devices that do much the same thing exist as well, mainly for guitars.