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: Doubles as a wallet ruler and protractor. 26 uni t conversions, 7 equations, and 10 physical constants to save you time looking up references in mechanical, civil, electrical, industrial, nuclear, and materials engineering. 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. Show more