Changes calculation results to exponent notation.  The “eng+” key increases the exponent portion with each press. The “eng-“ key reduces the exponent

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（Example）

eng＋: 1.23 -> 1.23E+00 -> 0.00123E+03 (kilo) -> 0.00000123E+06 (mega)

eng－: 1.23 -> 1.23E+00 -> 1230E-03 (milli) -> 1230000E-06 (micro)