1. Do I need to calibrate the barometer upon receipt?
Yes, once. The instrument is factory-set to sea level. If you live up to approximately 800–900 meters above sea level, you can set the pointer yourself to match the current atmospheric pressure reported by a weather station or weather radar in your area. Do you live at a higher altitude? Please indicate this in advance — for an additional fee, we will calibrate the instrument for your location. 2. How does the mechanism work? A falling pattern means approaching bad weather, while a rising pattern indicates clearing skies. 3. What does the second (trailing) pointer signify?
You set it yourself to the current reading. At the next reading, you can see at a glance how much the pressure has changed since then — the difference between the two pointers tells you more than the absolute number. 4. Does the barometer require a battery?
No. The aneroid measurement works entirely mechanically: a membrane senses the air pressure, and the pointer displays it. No power, no maintenance. 5. Where is the best place to hang it?
Indoors, out of direct sunlight and not above a heat source — temperature fluctuations make readings erratic. Air pressure is the same indoors and outdoors, so an interior wall is perfectly fine.