There are two ways to use the attached scale. You can set the mode to attached scale, or you can turn auto scale on.
To set the mode to attached scale:
Select Attached scale
The meter will now prompt you to select your class and any additional services
With auto scale turned on, if an item is placed on the scale, the meter will rate the item using the currently selected class. If the current class can not support the weight placed on the scale, it will prompt you to select a new class.