A graphing calculator is required for many UA Math courses. Calculators that perform symbolic manipulations (such as the TI89 or TI92 or TINspire CAS) cannot be used in courses at or below the Calc II level (Stats excluded). Below is a guide to which calculators are generally acceptable, and which ones are definitely not acceptable. It is always a good idea to also refer to your course syllabus and/or ask your instructor.
Acceptable Calculators:
TI83, TI83 Plus 

TI84 Plus, TI84 Plus Silver Edition, TI84 Plus C Silver Edition, TI84 Plus CE 

TINspire CX
This is not to be confused with the TINspire CX CAS pictured below. CAS is not allowed. The two calculators look identical except for the “CAS” printed in the upper right hand corner of the CAS version. 

TI85
These are getting hard to find, and harder to find someone who can help you with it.
TI81 and TI82 have more in common with the TI83 than with the TI85, but are probably just as hard to find. Both of these models are also acceptable. 

TI86
This model is more advanced than TI85, but TI86 has been discontinued. It is still an acceptable calculator to use, but again, familiarity with the model may be hard to find. 

Casio fx9750GII, fx9750G PLUS Most instructors will be far more familiar with TI calculators than Casio calculators, so help with these calculators may be hard to find. However, they are still acceptable. 

Casio fx9860GII Most instructors will be far more familiar with TI calculators than Casio calculators, so help with these calculators may be hard to find. However, they are still acceptable. 

Casio PRIZM fxCG10 

HP 48 series Includes the following models: HP 48S, HP 48SX, HP 48G, HP 48GX, HP 48G+ 
Calculators that are NOT allowed in UA Math classes:
TINspire CX CAS
Not allowed due to symbolic manipulation capabilities
(CAS = computer algebra system)
TI89, TI89 Titanium
Not allowed due to symbolic manipulation capabilities.
TI92
Not allowed due to symbolic manipulation capabilities.
Casio ClassPad II fxCP400
Not allowed due to symbolic manipulation capabilities.
Casio ClassPad 330 PLUS
Not allowed due to symbolic manipulation capabilities.
Casio ALGEBRA FX 2.0 PLUS
Not allowed due to symbolic manipulation capabilities.
HP Prime Graphing Calculator
Not allowed due to symbolic manipulation capabilities.
HP 49/50 series
Includes the following models: HP 49G, HP 49G+, HP 48II, HP 50G
(Note the HP 48II is actually part of the 49 series, not 48 series)
Not allowed due to symbolic manipulation capabilities.
TINspire CX CAS Not allowed due to symbolic manipulation capabilities (CAS = computer algebra system) 

TI89, TI89 Titanium Not allowed due to symbolic manipulation capabilities. 

TI92 Not allowed due to symbolic manipulation capabilities. 

Casio ClassPad II fxCP400 Not allowed due to symbolic manipulation capabilities. 

Casio ClassPad 330 PLUS Not allowed due to symbolic manipulation capabilities. 

Casio ALGEBRA FX 2.0 PLUS Not allowed due to symbolic manipulation capabilities. 

HP Prime Graphing Calculator Not allowed due to symbolic manipulation capabilities. 

HP 49/50 series Includes the following models: HP 49G, HP 49G+, HP 48II, HP 50G (Note the HP 48II is actually part of the 49 series, not 48 series) Not allowed due to symbolic manipulation capabilities. 