tachometer
n. 转速计，转速表
例句
The tachometer registers a rather high 3,000 rpm at 70 mph.
转速计在时速70英里时显示每分钟高达3000转。
《柯林斯英汉双解大词典》
To make an rpm-drop test, a tachometer is needed .
做每分钟转速下降试验时，需要一个转速表。
An electrical tachometer receives voltage pulses from the ignition system, usually the coil.
电器转速表从点火系统中接受电压脉冲，通常是线圈。
