Barograph n. : An instrument for recording automatically the variations of atmospheric pressure.

Example:
what measuring unit is used for a Barograph?

Taxonomy
barograph, recording, paper, free encyclopedia, aneroid barometer, pen, sailplane, pressure changes, foil, the drum, barometric pressure, knib, motion, altitude, tasks, weather, solid state, Three-day.

Defination from the web:
Barograph found in homes and public buildings these days are the 8-day type. ... Anemometer · Barograph · Barometer · Ceiling balloon · Ceiling projector · Ceilometer · Dark adaptor goggles · Disdrometer · Field mill ...