Meaning ofrev counterin English

Noun

1. a device showing engine speed in RPM; measuring revolutions
   The driver checked the rev counter to ensure the engine was running smoothly.
2. an instrument displaying RPM; monitoring engine operation
   The mechanic used a rev counter to monitor the engine's performance and diagnose issues.
   Synonyms:

   tachometerRPM gaugeRPM meterengine speed indicatorspeedometer