A must tool for engineers, technical persons and students who need to handle a lot of lineal length calculations. It is super fast and handy. Special features: 1. continuous calculation method. 2. can modify the input data during the data input process. 3. data input is almost error free. 4. with a unique quick range mover. 5. display 6 output styles, including Metric and Imperial formats. 6. results can be emailed. 7. with high accuracy levels: 1/8", 1/16", 1/32", 1/64", 1/128" & 1/256".