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    • Frank Gennari

      I’ve used this exact same trick on a TI-32 calculator back in around 1990 when I created a “Calcu-Measure” for the Duracell battery competition. You can do more than counting. If you add a wheel + rotary encoder, you can measure distances on curved surfaces. If you determine the linear distance per encoder tick, you can program the correct constants into the calculator to measure accurately in inches, mm, or whatever units you want.

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