Accurate atmospheric pressure readings require proper digital barometer handling. Follow these essential practices:
1. Calibrate Regularly
Factory calibration can drift. Set a baseline at a known elevation using local sea-level pressure data (QNH) from reliable sources like nearby airports or official weather stations. Recalibrate periodically, especially before critical use.
2. Ensure Stable Placement
Position the barometer away from environmental disturbances:
- Avoid temperature fluctuations: Keep away from direct sunlight, heating vents, drafts, and windows.
- Minimize vibration: Place on a stable surface, not near machinery or high-traffic areas.
- Prevent air current interference: Do not locate near fans, AC vents, or frequently opened doors.
3. Track Sea-Level Pressure Correctly
Understand the difference:
- Absolute Pressure: Measures actual pressure at your location's altitude.
- Relative (Sea-Level) Pressure: The display mode typically used for weather forecasting. Your device calculates this using its known altitude (entered manually or via GPS). Ensure the correct local elevation is set for meaningful trend analysis.
4. Monitor Trends, Not Single Readings
Digital barometers excel at showing pressure changes over time:
- Observe hourly/daily trends: A steady drop often indicates worsening weather; a steady rise suggests clearing or fair conditions.
- Ignore minor fluctuations: Small variations over minutes are typically noise.
- Record baseline: Note the average pressure at your location to identify significant deviations faster.
Consistent placement and calibration are vital for reliable trend interpretation.
