Barographs

The barograph is in charge of accurately measuring and recording variations in atmospheric pressure. It is an instrument used in professional meteorological observatories, and approved by WMO.

The 9 cameras that comprise it are capable of accurately detecting any variation in pressure, including changes that other digital sensors would not detect.
The movement associated with the pressure variation is transmitted mechanically to an arm with a marker which records the evolution of the pressure in graphical format on graph paper.