Designed especially for contractors estimators and surveyors. Handles any and all prints. Select any of the 111 common built-in scales or key in up to 19998 user set-able scales. Calculates square and cubic dimensions for regular areas and volumes. Counter and adder buttons on probe tip count items or add fixed lengths while scaling. Create store and retrieve two user-defined scale factors. Protective case and computer interface kit sold separately. Connects to any Windows application with XLU2 interface kit which includes software an instructional manual and USB cable.