A must tool for engineers, technical persons, and students who need to do a lot of tedious lineal length calculations. It is fun and with a short learning curve. Highlighted features are: 1. continuous calculation method(pro version) 2. can modify input data during the data input process. 3. eliminate the tedious work and it is error free. 4. with a unique quick range mover. 5. display six output styles with Metric and Imperial formats. 6. results can be emailed. 7. with six different accuracy levels, i.e. 1/8", 1/16", 1/16", 1/32", 1/64", 1/128", 1/256".