Simple pressure gauge for measuring air pressure as a barometer or altimeter.

The membrane pressure gauge consists of a vessel open at the top, which is sealed with a stretchable film. A cardboard strip or similar is stuck to the film in the middle as a pointer.

1. Vessel, open at the top
2. Stretchable film
3. Rubber ring
4. Strip of cardboard

Cup, tin, or similar

Cling film

Rubber ring