Texas Instruments TI-30 calculator
Tested; works. With manual.
The Texas Instruments TI-30 from 1976 is a scientific calculator with 8 digits precision and algebraic logic. It has 28 functions, 40 keys, and an LED (light-emitting diode) display, typical of calculators of this era.
This is the original in a long line of scientific calculators designated TI-30 (with various suffixes over the years), and sold in vast numbers. It is possibly the all-time best selling calculator.
Texas Instruments continues to use this name for its mainstream scientific calculator, mainly aimed at the education market.