A barometer.
A barometer measures air pressure.
A spirometer measures the amount of air in lungs
marometre
tyre pressure gauge.
Barometer is the instrument that measures air pressure
The latest weather forecasting instrument invented was the barometer. This instrument measures air pressure.
spirometer
Barometers measure air pressure.
aneroid barometer
It's a useful instrument for detecting weather. It measures air pressure.
a thermometer