Recommended for fabricators, engineers, designers, and students who like to try the slick tape measuring feelings. It is fun and easy to use with a short learning curve. You can verify the input data before performing the calculations. It is a good tool, especially good for aluminum framing fabrications. A video is included to show how the fast actual operation. Features: 1. continuous calculations method.(full version) 2. visualize your input lengths in proper format. 2. have output formats for imperial and metric units. 3. results can be emailed. 4. 6 levels of accuracy levels.