[Qgis-user] scale dependend representation?

[Sven Bauhan]

Hi,

I am trying to configure a layer, so that it shows different sized objects 
related to the actual scale of the map. I saw that there is the possibility to 
configure a rule based representation. But I could not figure out how i can be 
used to act scale based.
For example I have a layer with airports. When I see the whole layer I just 
want to display the biggest airports. When I zoom into the map the smaller 
airports up to all little heliports shall become visible depending on the 
scale factor.

Can someone tell me how i can configure a scale based representation?

Thanks,
Sven