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HP 50g Graphing Calculator, including pouch and USB cable. Virtually new. Spec: Best used for Engineering; Computer science; Surveying; Trigonometry; Statistics; Geometry; Biology; Chemistry; Physics Permission usage AP Calculus; AP Statistics; SAT Reasoning Test; SAT Subject Tests in Mathematics Level 1 and Level 2; PSAT/NMSQT; AP Chemistry/Physics Built-in functions Over 2300 Graphing functions 2-D Function, Polar, Parametric Plot; 3-D, Differential Equation, Bar Plot; Histogram, Scatter Plot; Find: Intersect, Extremum, Slope, Area; Zoom, Trace, Co-ordinates, Shade Scientific functions Decimal hrs/hrs min sec conversions; Polar/rectangular conversions; Angle conversions; Base conversions and arithmetic; Unit conversions; Bit, Boolean graphics; Display and printer graphics Statistical functions Σx, Σx2, Σy, Σy2, Σxy; Sample standard deviation, mean; Population standard deviation; Linear regression; Combinations, permutations; Weighted mean; Edit, save, name, list; Curve fit (LIN, LOG, EXP, POW); Plot statistical data; Hypothesis tests; Confidence intervals Math functions +, -, x, ÷, ?, 1/x, +/-, In, ex, x?y; yx, LOG, 10x, x2, %, ?, n!; Fractions; Degrees, radians, or grads mode; Trigonometric functions/inverses; Hyperbolics/inverses; HP Solve application (root finder); Numeric Integration; Symbolic Integration; Numeric differentiation; Symbolic differentiation; Complex number of functions; Polynomial root finder, Taylor series; Absolute value, round; Integer, & fractional part of a number; Modulo function, floor, ceiling; CAS system Memory 512 KB RAM Flash memory 2 MB Flash ROM Ports IrDA port (wireless); USB; serial Processor 75 MHz ARM9 Power AAA x 4 + CR2032 Power off memory protection Yes Auto power off User selectable, default 5 minutes Display Adjustable contrast, 9 lines x 33 characters + 2-line header + 1-line menu, 131 x 80 pixels Display type LCD