Title: Piece of Junk
Product review: With my old HP42s to compute sqrt(-1) you punched 3 keys: 1, +/- (change sign), sqrt; simple, straight forward RPN. For the HP35S the same key strokes give "INVALID DATA". You can ultimately compute the sqrt(-1), but it takes about 8 or 11 key strokes. Cannot give the exact sequence since I returned the calculator. I feel sorry for anyone who thinks this is a good calculator, they may not have had a real HP before the greed of Fiona. Too bad zero stars are not allowed.
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