A scale meter? Do you mean a bar graph or to put an actual ruler into your app Lia?
Here are two ways to make a bar graph.
If you need a 'ruler' you can use an png image of a scale next to the button or as a sprite in the canvas, depending on how you make your 'vertical' bar graph.
Is this what you wanted to create? If not, show us a picture of what this vertical scale should look like.
Regards,
Steve