Quick Answer:The Aneroid Barometer is a dial barometer with a metal capsule movement, marked in both millibars and millimetres, mounted on a plastic base with a hanging ring and 7.5 inch in overall diameter.
Last updated: 19 October 2026
Key Features
Cylindrical metal case with dial, pointers and glass front cover.
Metal capsule with flexible sides moves the pointer through levers and pulleys.
Scale marked in millibars and millimetres.
Plastic base with a ring for hanging.
Includes an activity guide.
Technical Specifications
Specification
Value
Case
Cylindrical metal, glass cover
Scale
Millibars and millimetres
Overall diameter
7.5 inch
Mounting
Plastic base with hanging ring
Packed weight
1.4 lb
Included
Activity guide
How It Is Used
When atmospheric pressure rises, the air in the capsule is compressed and its walls move in; when pressure falls, they move out. Levers and pulleys pass this tiny movement to the pointer, so changes in air pressure can be read straight from the dial.
Frequently Asked Questions
What units does the Aneroid Barometer show?
The dial is marked in both millibars and millimetres.
How does the Aneroid Barometer work?
A metal capsule with flexible sides changes thickness as air pressure changes. One end is linked to the pointer by levers and pulleys, so any change in the capsule moves the pointer.