Texas Instruments is the Largest Selling Scientific Calculator Brand in USA 11 Digit Scrollable Entry Line with 10 Digit Answer and 2 Digit Exponent, Can Retain Previous Entries Memory Values Individual Statistics Elements 5 Memories 20 English or Metric Conversions 11 Physical Constants Octal Decimal and Hexadecimal Number Bases Boolean Logic Operations Complex Number Calculations Two-variable Statistics with Regression