Besides mercurial barometer (Fortin’s barometer), there are other types of pressure recording instruments such as aneroid barometer, altimeter (altitude barometer), barograph (an automatic recording aneroid barometer), micro- barograph and micro-barovariograph.
This last pressure-recording instrument is an extremely sensitive atmospheric pressure recorder. It records very small changes in atmospheric pressure changes of the magnitude of hundredths to thousandths of a millibar.
This instrument is so sensitive that it is capable of detecting even the minute pressure, fluctuations produced by the passage of waves through air.
Pressure fluctuations associated with the passage of a severe atmospheric disturbance or even large nuclear explosions in the atmosphere are easily detected by this sensitive pressure recording device.