Screen.pixelDensity vs Screen.logicalPixelDensity

[TT_NBE]

Hello,

I'm polishin the layout of my app and I would like to set the size of items the same (in millimeters) across different platforms (currently I can test on Windows and android).

The setup is simple
@import QtQuick 2.0
import QtQuick.Window 2.0
Item
{
height:15*Screen.logicalPixelDensity //this works on windows
....
}@

On window this is perfect, the item is 1.5 cm high

On android (or at least my android device) the items are smaller, but I can get it to work perfectly by replacing the Screen.logicalPixelDensity with Screen.pixelDensity.

But if I use Screen.pixelDensity than items are too small on Windows.

So should I try to figure out the platform at runtime and use a javascript function to calculate the height based on that platform? Or is there a better option?