[EricH]

I'm assuming that almost everyone here has a calculator. So, here's the question: What do you use, and what is your best tip for it?

Explanation: What kind of calculator (include the model, if possible) do you use? What tip or advice would you offer to a beginner on the calculator?

Go ahead and make comments on how your experience with someone else's calculator type was (if you had one), include all the goodies, or tell how many you have. Or anything else that would further the discussion.
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One of my calculators (the one I use most often right now): TI 84 Plus Silver. Tip: Be careful on entering data for graphing. Enter it wrong and you get an error or a wrong graph (painful experience earlier today ).