From Wiki

Texas Instruments TI-36X Solar

• Type: Semi-Algebraic Electronic Calculator
• Size: 6 x 3 inches / 15 x 8 cm
• Serial/Lot number: none / S-0204B
• Date of Manufacture: February 2004

With instruction booklet, hard shell case and quick reference card. Solar powered. A scientific calculator with one and two variable statistics, hyperbolic functions and binary math in bases 2, 8, 10 and 16. I only got it because it had a [3rd] key. Eight various physical constants can be entered using [3rd] [CONST] [(key)]. Five metric unit conversions, with emphasis more on science class than on real life. Binary math is integer-only, so certain floating-point functions can do double duty as the hexadecimal digits A through F. Does fractions for war-weary seventh graders.