轉速錶

tachometer / RPM gauge

see 轉文|转文[zhuai3 wen2]

to turn / to change direction / to transfer / to forward (mail) / (Internet) to share (sb else's content)

to revolve / to turn / to circle about / to walk about / classifier for revolutions (per minute etc): revs, rpm / classifier for repeated actions

angular velocity / number of revolutions per minute

fast / rapid / quick / velocity

wrist or pocket watch