15
Regret
Low regret
Casio
Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"
95% would buy againElectronics
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What owners love
- ✓Handles complex engineering calculations without needing a computer
- ✓Natural textbook display makes equations actually readable on screen
- ✓Battery lasts years; barely need to replace it
What owners regret
- ✕Learning curve steep if you haven't used scientific calculators before
- ✕Small buttons cramp your fingers during long calculation sessions
