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This review is from: Casio FX 83 ES Calculator (Office Product)
Covers all of the main functions and probably much more. The display is clear and bright and seems to draw very little power, judging by the very long battery life. The slip-on cover (which probably ought to be described as a clip-on cover) offers hard protection, allowing you to throw the calculator in a bag/briefcase with little concern for what damage keys, etc might do.