What context can I use each word in?
Learn when and how to use these words with these examples!
tachometer
Example
The tachometer showed that the engine was running at a high RPM. [tachometer: noun]
Example
He checked the tachometer to make sure the machine was operating at the correct speed. [tachometer: noun]
speedometer
Example
The speedometer showed that he was driving over the speed limit. [speedometer: noun]
Example
She glanced at the speedometer to make sure she was driving at a safe speed. [speedometer: noun]
Good things to know
Which word is more common?
Speedometer is more commonly used than tachometer in everyday language since it is a standard feature in all vehicles. Tachometer is less common and is typically used by people who work with engines or machinery.
What’s the difference in the tone of formality between tachometer and speedometer?
Tachometer is more technical and formal than speedometer, which is more casual and commonly used in everyday language.
