1. Do I need to set the barometer after receiving it? Yes, just once. The instrument is factory-set to sea level. If you live at an altitude of up to approximately 800–900 meters, you can set the pointer yourself to match the current air pressure reported by a weather station or weather radar in your area. Do you live higher? Please indicate this in advance — we can set the instrument for your location at an additional cost. 2. How does the mechanism work? A falling pattern means bad weather is approaching, while a rising pattern indicates clearing. 3. What does the second (trailing) hand mean? 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 hands tells you more than the absolute number. 4. Does the barometer need a battery? No. The aneroid measurement works entirely mechanically: a diaphragm 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 unstable. Air pressure is the same indoors and outdoors, so an interior wall is fine.