tachometer

A measuring instrument used to indicate the speed of rotation of a shaft or disk, commonly found in vehicles and machinery.

• 🇨🇳用于测量旋转轴或圆盘的转速的仪器，常见于车辆和机械中。

1. Speed measuring device B2 formal technical

   An instrument that measures the rotation speed of a shaft or disk, typically in revolutions per minute (RPM).

   • The mechanic checked the tachometer to see if the engine was idling correctly.
   • In a car, the tachometer helps the driver know when to shift gears.
   • The boat's tachometer showed the propeller was spinning at 3000 RPM.

   🇨🇳转速表

   同义词: tach

• tachometers plural form
• tachometers' possessive plural form
• tachometer's possessive singular form