Title: My Two HP-35S Calculators are Both Defective
Product review: Both of my HP-35S calculators have the same problem. They frequently ignore key strokes resulting in incorrect answers. For example, I press the enter key. Most of the time it records the enter key stroke. Some of the time it doesn't. The same is true for any other key that gets pressed. You have to constantly check the display for entry accuracy, otherwise the answer it gives may be wrong.
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