Careful, its a similar shape to the terrorist casio.
Type: Posts; User: GravelBen
Careful, its a similar shape to the terrorist casio.
Mean Sea Level Pressure ... thats the one you see on weather maps.
If you're wanting to convert absolute pressure to MSLP then altitude matters ;)
Most of them use barometric pressure to determine altitude, so you have to recalibrate them at known points for accuracy as the pressure changes. I have an old Timex watch with alti+barometer etc,...