Texas Instruments,‎ Calculators, Scientific Model TI-30XIIS

Texas Instruments, Calculators, Scientific Model TI-30XIIS Functions: Five memory registers; two-variable statistics; common and natural logarithms; universal powers and roots; reciprocals and factorials and many more Display: alphanumeric; 2-line display Special features: memory retention allows users to edit and view current entries as well as previous entries. * Algebraic entry logic * Functions: math, exponential, trig., inverse trig., statistical functions (mean and standard deviation); angle/time conversions * Protective sliding case