Wiktionary
rate of climb indicator
n. (context aviation English) An instrument installed in an aircraft that indicates the rate at which the aircraft is gaining or lose altitude.
Usage examples of "rate of climb indicator".
As Bill lowered himself into the seat, Florentino climbed onto the wing root and watched, prepared to help, as Bill fastened his shoulder and lap belts, and then as Bill set the clock, the altimeter, and the rate of climb indicator to zero.
He checked the rigging and equipment, the altimeter, charts, a pyrometer to monitor the temperature of the envelope, a rate of climb indicator, and a tool kit.