- Car’s rev gauge - Dashboard gauge - Instrument to measure revolutions of a car engine - It measures the rate at which something turns - Rev counter - An instrument for measuring the velocity, or indicating
changes in the velocity, of a moving body or substance. - An instrument for measuring the velocity of running
water in a river or canal, consisting of a wheel with inclined vanes,
which is turned by the current. The rotations of the wheel are recorded
by clockwork.