The Pocket Engineer - Wallet Ruler and Conversion Reference

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Always be ready to measure, calculate and fix anything with The Pocket Engineer. Packed with features in laser-cut stainless steel the size of your credit card: 26 unit conversions , 7 equations, and 10 physical constants to save you time looking up references in mechanical, civil, electrical, industrial, nuclear, and materials engineering. Doubles as a wallet ruler and protractor. Photogrammetric ruler to calibrate length and tilt in images when used as a scale in field or lab work. Pipe inner diameter measurement from 0.25"-1.25" and machinist scale with 10-mil resolution. Here's how to use me! Show more