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Hi DR515
The CFA institute only authorize two different calculator models: The Texas Instruments BA II Plus and the Hewlett Packard 12C (There are some different versions of the Hewlett Packard calculator but it is essentially the same model). When I sat the tests the vast majority would use the Texas Instrument calculator. The HP calculator seems a bit “old school” for lack of a better description. Unless you are already familiar with the HP calculator (which doesn’t seem to be the case) I would stick with Texas Instruments. You can’t go wrong with that one!
Best of luck with the test!