Think of a hand turning something slowly — a , a , a dial — and stopping the moment what comes out lands exactly on the right point: a note that matches the other notes, a station that arrives clean instead of noisy. A tuner is whoever, or whatever, does that turning or helps you find that point. Sometimes it is a person with a good ear, sometimes a small screen that shows you the distance, sometimes a part inside a machine.
From the word’s history
Wiktionary traces the word to tune (verb) + -er, with -er going back through Middle and Old English -ere to Proto-Germanic *-ārijaz. The suffix builds both people and things that do a job, which is why one word covers a piano tuner and a radio tuner.
字源上，tuner 來自 tune（動詞）加上 -er；-er 從中古英文、古英文的 -ere 一路上溯。這個字尾造得出「做事的人」，也造得出「做事的東西」，所以同一個字既能指調音師，也能指收音機裡的零件。
Wiktionary, 'tuner' (etymology 1: From tune (verb) + -er), packet source_ref kaikki:3f6f69a190036ae4:748078139
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