Get to certain value from another class

I have a slider class, something like this:

and in the end it calculates slider value based on its position and outputs that value in a textfield, but how do I get to this value from another class so i can do something with it?

private function updateValue():void {

   _holder.sliderValue = Math.floor( (_handle.x * 100 ) / _track.width);
   _txt.text = _holder.sliderValue;