tachometer

Noun
  1. Measuring instrument for indicating speed of rotation (synset 104389967)
    is a type of: measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
    subtypes: tachograph - a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle
    same as: tach

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