# Set Object Size

Note: This step is exclusive to the Counter application.

The Set Object Size step allows you to define the size of objects the vision sensor looks for and counts.

Set the Object Size by moving and resizing the rectangle to fit around the object you want the tool to count. The Object Size area cannot be rotated.

For the best results, aim for a symmetrical object or select the area of a symmetrical feature.

Note: Modifying the Object Size after training the tool with a large number of images can take a long time.