This aneroid barometer is marked in both millibars and in millimeters.  (Use the conversion chart to find pressure in inches.)  Mounted on a plastic base, this instrument measures air pressure. Comes with a ring for easy hanging. Includes an instruction sheet for setting the barometer, history of the barometer and description of how an aneroid barometer works along with activities you can do.  Overall Diameter is 7.5″

 

For Laboratory use only.

Not for use by children under 8.