Air pressure: amazing accuracy

• 

  bimbam

  Posted: 03.10.2025 13:46

  Modified: 27.10.2025 04:15

  I have an Aranet Rn+ on the ground floor and an Aranet 4 on the first floor, about 3m higher. 

  Air pressure change is 1 hPa every 8 m, so it should be 0,37 hPa at 3m.

  Now look (as shown in Home Assistant): 

  

   

  Update:

  Both devices now side by side. Even temperature and humidity show amazing accordance, suggesting a decent accuracy.

  
• 

  aranet-techsupport

  Posted: 06.10.2025 06:13

  Hi!
  
  Keep in mind the accuracy of the sensor is this:
  
  
  Such small changes wouldn't really be accurate on the sensor.
• 

  bimbam

  Posted: 07.10.2025 13:00

  Comparing two sensors, I would have expected that the pressure is 1, 2 or 3 hPa apart.

  That both sensors show exactly the same value down to 0.1 hPa might of cource be coincidence, but anyway, it is amazing. 

  So my subject "amazing accuracy" is not really correct.

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