Tired of old fashioned calculators losing their battery charge in the middle of an exam.ThinkGeek has the answer for you: A genuine slide rule:
Product Features
Performs the following calculations: Multiplication, Division, Squares, Square Root, Cubes, Cube Root, Proportion, Logarithms, Sine, Cosine, Tangent, Cotangent- No batteries required
And yes, I used to use one...
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