1. Do I need to set the barometer after receiving it? Yes, once. The instrument is set to sea level by default. If you live up to approximately 800–900 meters above sea level, you can set the pointer yourself to match the actual air pressure from a weather station or weather radar in your area. Do you live higher up? Please indicate this in advance — we will adjust the instrument to your location for an additional fee. 2. How does the mechanism work? A falling pattern means approaching bad weather, rising means clearing. 3. What does the second (trailing) pointer mean? You set it to the current reading yourself. 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 need 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 reading unstable. Air pressure is the same indoors and outdoors, so an interior wall is fine.