Texas Instruments TI-34.

A classic scientific calculator known for its reliability in middle school math and general science.

Most useful features:

1. The "Magic" Blue Key (2nd)

The 2nd button (bottom left) is your most important tool. It activates the functions printed above the buttons in blue.

To turn it off: Press 2nd then AC/ON.

2. Working with Fractions

The TI-34 is famous for its dedicated fraction handling.

Great condition. 

Tested works.

Very little wear.