A level Physics- Are calculators with engineering symbols allowed?

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tpb1908
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I recently moved from a Casio fx991es plus http://www.casio-intl.com/asia-mea/e...plus/?m_no=176 to a Casio fx991ex http://www.casio-intl.com/asia-mea/e...sswiz/fx991ex/, which is a faster and more advanced version, providing more features for further maths etc.

However, one of the features of the newer calculator is that it can insert engineering symbols when calculating values.

For example, if one unit has a prefix of kilo, and another a prefix of micro, rather than converting the values manually, I can just use the given values, and add the prefix in front of the value.

My Physics teacher isn't sure if this is allowed.
The older Casio calculators already have facilities that allow for unit conversions, and they have constants, such as the mass of an electron, or its charge, however they haven't done this before.

Do you know of any rules for the Physics exams regarding calculators? I looked, but only found pages on the Maths exams, which are concerned with symbolic integration, differentiation etc.
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