The Alvin Scalemaster II w/Interface Kit solves the critical needs of architects, engineers, and designers when looking at plans and making the necessary calculations for materials, space, or other design challenges. This version includes a CD for software installation on Windows® operating systems for the PC interface. The unique usefulness of this system is the measurements are accurately made by simply rolling the hand-held device over the lines in the drawings. This is extremely helpful when making plans, estimates, or bidding on a job. The design of the hand-held tool has comfort. The LED clear display reads easily. The system is very versatile and useful for calculating distance, volume capacity, and area.