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1. Make sure it is calibrated.
Click here for information on how to calibrate a barometer.
2. Give it a light 'tap' with your finger.
This is because the delicate combination of linkages that convey the pressure from the aneroid capsule to the needle can be 'sticky'. The resistance in the metal components can be just enough to prevent the needle responding to small movements in the thickness of the capsule.
3. 'Rain, change and fair' are just decorative!
These words on the dial are traditional and not truly indicative of weather conditions for Australia.
4. Take readings at the same time each day.
There is a natural variation in air pressure each day and night of about 3 hectopascals even when weather systems aren't moving.