How to Set a Starting Reading on a Barometer
A barometer is a handy tool for anticipating changes in the weather. The barometer measures the changes in the atmospheric pressure. If the pressure is dropping, it's likely that clouds and rain are on their way. If the pressure is rising, clears skies are on the horizon. Learning to read a barometer is more complex than learning to read a thermometer. A barometer gives a relative reading. You must know how the information has changed to properly interpret it. To get accurate readings, you must first set the starting reading on your barometer.
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Instructions
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Setting a Barometer
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Check the local weather station or newspaper weather reports to get a current barometric reading.
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Locate the small hole on the back of the barometer. It gives you access to a small screw. Use a small screwdriver to adjust the hands of your barometer.
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Watch the hands as you make the adjustment. They should move in a clockwise direction until they match the current reading you took from local weather reports.
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Use the dial on the front to adjust the pointer to line up with the needle. When you want to see how the pressure has changed, gently tap the glass of the barometer. The needle will move. You can look at the change between the pointer and the needle to determine how the atmospheric pressure is changing. Reposition the pointer above the needle's new location so that you are ready to take your next reading. Generally, it is best to allow several hours between readings.
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