tachometer
A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
(transitive) To restore (a mothballed project or equipment) to active use.
(sports) An umpire or judge; an official who makes sure the rules are followed during a game. / A person who settles a dispute.
(idiomatic) From the beginning; starting with no advantage or prior preparation. / (idiomatic) From basic materials or raw ingredients.
レースの前に、彼女はエンジンが安全な回転数の範囲内にあるか確認するために回転計をチェックした。
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