Texas Instruments TI-89 Titanium Graphing Calculator
I have at least one of almost every model of HP graphing calculator, and many other models, going all the way back to 1972 and the HP 35. It never occurred to me that the TI-89 series could actually be competitive with HP. Well, it is! This calculator has some very nice features, and a few features that the similarly capable HP 49G does not.
DA: 74 PA: 66 MOZ Rank: 40