the Fitbit mobile app
This is an aircraft inspired basic altimeter.
Onscreen buttons for adjustments:
+ Increase the set pressure (QNH) in steps of 1 hPa.
- Decrease the set pressure (QNH) in steps of 1 hPa.
R Reset needles to 0 feet.
DISCLAIMER: This is for entertainment purposes only. Do not use in a situation that might cause injury to humans! We can not be held responsible for any wrong readings that might occur.