The Scale Master 6020 is perfect for measuring and converting floor plans, whether you?re in the field or the office. With 72 built-in scales, 39 U.S. and 33 Metric, you?ll be able to roll this over your plans and convert them to what you need so you can get proper estimates for materials like concrete, fencing, paving, or plumbing. Beyond measuring and converting, this tool also has a wide variety of built-in functions. If you have a rectangle, you can measure the length and width and the 6020 will instantly tell you the area in square feet. It also has an accumulating memory which lets you retain totals for plans spanning multiple pages. You may not get every roll perfect, either, which is why a subtract function lets you undo any of your measurements so you can try it again. If none of the built-in scales work for you, you can manually plug in your own conversions to get what you need. The Scale Master 6020 is a handy, all-in-one device that will give you fast and accurate plan measurements and conversions. With the ability to produce accurate scales you can get the information you need now, so you can save money later.From the ManufacturerThe new Calculated Industries 6020 Scale Master Classic Calculator gives you simplicity, versatility and accuracy while maintaining the same award-winning ease-of-use, quality and reliability you expect from a scale master. No other plan measure gives you more for less! 72 built-in scales for more versatility. Six user-set custom scales calibrates to faxed, out-of-scale plans and plan books. Two built-in memories for easy area/volume and storing values. More dimensional units eases use.