HP-40G

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The HP 40G is an algebraic entry only graphing calculator from HP. Based on the HP-38G design, numerous firmware improvements and the inclusion of a CAS made this a very capable math platform.

The hardware is identical to the HP-49/39G series (complete with rubber keyboard), and the CAS is identical to that used in the HP-49G. Unlike it's "bigger brothers", the HP-40G has no flags to set/mis-set resulting in a "better behaved" calculator for straightforward math analysis. Additionally the HP-40G does not have infrared connectivity, and is limited to 27 variables. A list-based solver, and other handicaps make this simple to use calculator less adapted to higher end use. The hp 40G is not allowed for use in many standardized tests including the ACT and SAT tests.