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Casio 991ms and 991es calculator?

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how will i know that the calculator that i bought is original and authentic casio product?my friend told me that there's something to press in the calculator but he can't remember it..can you help me?

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  1. turn on the claculator, press SHIFT, RCL and ON at the same time. then press SHIFT for many times. this is a test for the 991ES

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