Recommended for engineers, fabricators, designers and students who like to try with the slick tape measuring feelings. You can verify the input lengths before performing the super fast calculations. It is a great tool especially for aluminum fabrications. Two detailed videos show exactly how smooth and how swift the calculations. Highlighted features: 1. no more digits input keys with less errors. 2. continuous calculating methods. 3. has 6 output formats.(3 for Imperial and 3 for Metric). 4. has 6 levels of accuracy levels. 5. quick range mover and fine tune adjustments. 6. results and be emailed.