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Guide

How to Choose a Barometer for Environmental Monitoring

Pressure is the quiet variable in environmental monitoring. It corrects gas sensors, drives radon entry, forecasts weather and gives altitude. A digital barometer costs little, but the choice between absolute and sea-level pressure, and the accuracy and logging you need, deserve a few minutes.

By the Akermin Editorial Team · 3 min read

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Choose a barometer with a MEMS pressure sensor stating ±1 hPa accuracy and 0.1 hPa resolution, a display or app that shows both absolute (station) pressure and sea-level pressure once you enter your altitude, and a trend or logging function so you can see changes over hours. Decide the form: a standalone digital barometer or weather station for weather and home records; a pressure channel inside an air quality monitor for sensor compensation; a bare sensor module for a custom logger. Check it once against a nearby airport or weather service reading.

Why measure pressure

  • Weather: a falling trend of more than about 3 hPa in three hours signals approaching wind and rain; a steady rise, settled weather.
  • Gas sensor compensation: NDIR CO₂ readings and electrochemical oxygen readings shift with pressure; monitors with a barometer correct for it. See CO₂ monitor accuracy explained.
  • Radon: falling pressure draws radon from the soil; pressure logs explain radon swings. See what radon is.
  • Altitude: pressure gives altitude to a few meters once referenced.
  • Building pressure: differential pressure between inside and out (a different instrument, a manometer) shows whether a house is depressurized by extract fans, which affects combustion appliances and radon entry.

Specifications

Spec Look for
Accuracy ±1 hPa; ±0.5 for research
Resolution 0.1 hPa
Range 300 to 1,100 hPa covers sea level to high mountains
Units hPa, mbar, mmHg, inHg switchable
Sea-level correction Altitude entry or reference-pressure entry
Trend 3-hour and 12-hour change; graph
Logging Hourly readings for weeks; export
Temperature compensation Stated; MEMS sensors drift with temperature

Forms

  • Weather stations (Netatmo, Newentor, Ecowitt and similar) include a barometer with trend, history and often an app. The easiest route for weather and home records.
  • Air quality monitors with pressure (Aranet4, Airthings View Plus, GoveeLife H5140) use it for compensation and expose it in the app.
  • Standalone digital barometers for a desk or a boat; check they state accuracy.
  • Sensor modules (Bosch BMP280/BME280/BMP390, TE MS5611) for DIY loggers, with ±1 hPa or better and excellent resolution.
  • Aneroid dial barometers: decorative and drifting; adjust against a reference and treat as a trend indicator.

Absolute versus sea-level

Pressure falls about 12 hPa per 100 m of altitude. A sensor at 300 m reads about 977 hPa on a day the forecast says 1,013. Enter the altitude (or the current sea-level pressure from a nearby station) and the meter displays sea-level pressure for comparison. Keep absolute pressure for sensor compensation and altitude calculation.

Checking it

Compare the sea-level reading with a nearby airport METAR or weather service at the same time; agreement within 1 to 2 hPa is fine. Most digital barometers allow an offset. Aneroid dials have an adjusting screw on the back.

Barometers and weather stations sit in the environmental monitoring category; for logging setups, see how to set up long-term environmental data logging.

Netatmo Smart Weather Station with Wall Mount - WiFi, Radio, Indoor and Outdoor Sensor, Weather Forecast, Hygrometer, Air Quality, Compatible with Amazon Alexa, Apple HomeKit and Google Home, NWS-AMZ

Netatmo Smart Weather Station with Wall Mount - WiFi, Radio,

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Newentor Weather Station Wireless Indoor Outdoor Thermometer, Black,1Sensor

Newentor Weather Station Wireless Indoor Outdoor Thermometer, Black,1Sensor

View on Amazon

Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

What accuracy should a barometer have?

±1 hPa (about 1 mbar or 0.03 inHg) is good for weather and compensation uses; ±0.5 hPa for research. Resolution of 0.1 hPa lets you see trends over hours.

What is the difference between absolute and sea-level pressure?

Absolute (station) pressure is what the sensor actually measures at your altitude. Sea-level pressure adds a correction for altitude so readings can be compared with forecasts and other sites. Set the meter's altitude or a known reference to get sea-level.

Why do CO₂ monitors care about pressure?

NDIR sensors count molecules in the light path; fewer molecules at lower pressure mean a lower reading for the same ppm. A pressure sensor lets the monitor compensate, which matters at altitude.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.