What is the range of possible atmospheric pressures on the surface of the Earth? I'm developing an Android app which uses a pressure sensor. Due to storage limitations I have to normalize and scale the atmospheric pressure values. For this I need to know the extreme values of pressure.

Different conditions should be respected, e.g.


Weather conditions (low/high)
Locations (high mountains, deep valleys like Dead Sea with a surface elevation of: -427 m (−1,401 ft))


If this is unknown, does anybody know the range at sea level? Something like 1013 hPa ± X?

With a formula I've found I calculated that the pressure on Mount Everest should be something like 300 hPa and at Dead Sea about 53 hPa more than at sea level. But this is not a very complex formula, so these values might be theoretical and wrong.

Edit / additional info

I discovered that my sensor provides values like 980.01 hPa, so there are 2 digits precision (don't know whether this reflects sensor precision). A difference of 0.01 hPa means ~8cm altitude. This might sound little, but I need to calculate the current incline of athletes, so I cannot sacrifice precision. My current scaling algorithm produces normalized numbers from 0 to 32768. It would imply much work to change the output range.
Presssure at the Mt. Everest summit has been measured to be 253 Torr (337 hPa).  http://jap.physiology.org/content/86/3/1062

Pressure at the Dead Sea as high as 1079 hPa is reported in Fig. 12 of this reference: http://isramar.ocean.org.il/isramar2009/DeadSea/Hecht&amp;Gertman_2003_DS_Climate_Chapter4.pdf 

As far as at sea level, 870 hPa was measured for typhoon Tip in 1979. http://www.wunderground.com/blog/weatherhistorian/world-and-us-lowest-barometric-pressure-records

And 1067 hPa at coastal areas of Estonia and Lativa are reported here: http://www.wunderground.com/blog/weatherhistorian/world-and-us-anticyclonic-high-barometric-pressure-records