ThinkGeek Slide Ruler

 ThinkGeek Slide Ruler - Photo 

I've actually never seen one of these, but i feel like learning how to use this would be a good skill, you know-- for the rare event I dont have google, a calculator, my phone, or another person to help me out.


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  • edaniels1216

    's recommendation

    I've actually never seen one of these, but i feel like learning how to use this would be a good skill, you know-- for the rare event I dont have google, a calculator, my phone, or another person to help me out.

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