Brand: CASIO
Model: fx-82SX FRACTION
Type: Scientific calculator
Picture: CASIO fx-82SX
Batteries: AA x 2
Lifetime: Introduced: around 1997
Terminated: unknown
Notes: The CASIO fx-82 series started with the CASIO fx-82, an ordinary scientific calculator. But But CASIO kept extending this line, turning it not into just a model number but a whole calculator series. Trying to make it the non-programmable scientific calculator for school use.

So far I've found mention of the following types:

This one is basically the CASIO fx-82 with a few added features and a more 'modern' (and imho uglier) look. Added are a 10 digit display, more statistical functions including nPr and nCr, the famous fraction key, static memory and SCI and FIX modes which are also static. The case has a protective cover which is probably quite useful at school.