All TI-30X and TI-36X models are allowed (Any Texas Instruments calculator should have "TI-30X" or "TI-36X" in its model name). These TI calculators will be recognizable for those accustomed to using TI-83s, TI-89s, and similar models.
Texas Instruments TI-30XIIS Scientific CalculatorTI-36X Pro Scientific Calculator
All fx-115 and fx-991 models are permitted (Any Casio calculator should have "fx-115" or "fx-991" in its model name).
FX-115ESPLUS Casio FX115ESPLUS Scientific Calculator BlackCasio FX-991ES Plus Scientific Calculator
All fx-115 and fx-991 models are permitted (Any Casio calculator should have "fx-115" or "fx-991" in its model name).
HP 35s Scientific CalculatorCasio FX-991ES Plus Scientific Calculator