HP NW238AA 30b Financial Calculator, 12-Digit LCD HEWNW238AA HEW NW238AA, Feature-packed and programmable, the 30b offers quick solutions for business and financial calculations. Powerful math library including trigonometry, hyperbolic and advanced probability functions. Nine statistical models, standard error, covariance and more. Intuitive layout with scroll keys for easy navigation plus dedicated keys for common math functions. Power Source(s): Battery; Display Notation: Alphanumeric; Number of DisplayDigits: 15; Display Characters x Display Lines: 12 x 2., UPC 884962456705