beersmith app hydrometer problem

Hi, why is it that when I use the hydrometer adjustment tool in the android app does it show a test water sample 1.000 at 20 degs as 1.001 ? surely it should read 1.000mat 20 degs ??
If this is correct would that make my reading during the brewday all incorrect ?

Just guessing.  Is there a place in Beersmith to set your hydrometer calibration temperature?  Either 15°C or 20°C.  If the Beersmith hydrometer calibration temperature is set for 15°C it will show adding 0.0009 gravity points for a measurement at 20°C.

yes there is on the pc version but not on the android app strangely