This is one of the few machines that still work on RPN math
To those that are used to this, like engineers, it's a must
So dont mater its an old model, it still be very good to buy some extras, like I do, because those machines have the stinky habit to stop working its keyboard when get wet (there is a connector inside it that oxide and it stops working. I did lost 3 of those machines this way till now)
The cons are its priceGet more detail about HP 48GII Graphic Calculator (F2226A).
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