Frequently Asked Questions

When you purchase a barometer, you must always correct the barometer to your local airport to be accurate.

This is because ever installation is at a different altitude, and pressure is profoundly affected by altitude.

1. Make sure you have calibrated the barometer to match the local airport. There is a discussion here:
   

   Relative Barometric Pressure Does Not Match Official Source.

2. Make sure you do not live above 3,000 feet.If you live at high altitude, your barometer may be out of range (reads low all of the time).Since barometric pressure is significantly affected by altitude (and to a lesser extent, changes in weather), the barometer must be calibrated to sea-level to offset altitude effects.If your altitude exceeds the measurement range of the sensor mechanism, the barometer can not be adjusted to compensate for your altitude effects. Most sea-level barometers operate up to 3,000′. You will need to purchase a barometer that is designed for higher altitude conditions.
3. To adjust the barometer, there is a set screw on the back of the barometer that resembles the figure below (Reference D).