CASIO fx‑250C


Brand: CASIO
Model: fx-250C
Type: Scientific calculator
Picture: CASIO fx-250C
Batteries: LR 44 x 2
Lifetime: Introduced: unknown
Terminated: unknown
Notes: A model quite like CASIO's later fx-82 models but without a fraction key.

The calculator is very dark and the secondary functions (especially the statistical functions) are hard to read.

This calculator has constant memory, hence the "c" in the type designation.

Most of CASIO's school calculators use cheap and long lasting AA batteries, this one however uses two button cells and is therefore much thinner.

This calculator (as do many other CASIO scientific calculators) uses one and the same key for both the constant π as well as exponents. This works as follows. When you first enter digits, the "EXP"-key will enable you to enter the numbers exponent, otherwise it will enter the constant π.

I found the specimen on display here at a flea market (brocante) in Nyons in France when I was on holiday there in 2006.