Instruct: Classify a review as either positive or negative.
Query: Back to RPN

I am a semi-retired mining engineer. I have missed the RPN calculators the last few years, having used them for almost 40 years. This was like greeting an old friend. Thank you Hewlett-Packard. It is a little more advanced than my first, an H-P 30, and is similar to an H-P 45S(?), from a later incarnation. And it does more than I need at my relatively advanced age.