![The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Digital diary, Graphing calculator, Square roots The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Digital diary, Graphing calculator, Square roots](https://i.pinimg.com/736x/23/c0/ac/23c0ac2465458f146917410dedcd5549--square-roots-sf.jpg)
The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Digital diary, Graphing calculator, Square roots
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