HP 17BII Financial Calculator
This is THE standard when it comes to financial calculators. Show up at a business meeting with the trusty and functional HP 17B and you'll look like you know what you are doing even if you don't. Of course, to really impress you have to switch the calculator to RPN (Reverse Polish Notation) mode versus the standard Algebraic mode. It's what all the folks in financial services use to crunch numbers. Regardless of your mode preference, this calculator will easily switch back and forth and handle almost any of your number crunching needs.
A financial calculator, yes indeed.