Check the listing for details. The Pocket Engineer - Wallet Engineering Ruler Scale and Unit Conversion Refe.... Condition: New. Listed at 18.97 USD. The Pocket Engineer - Wallet Engineering Ruler Scale and Unit Conversion Reference 3 inch ✓ Free 60 Day Returns ✓ Free Express Shipping Description: Features: FITS WITH YOUR CREDIT CARDS: Sized exactly to a standard credit card or ID for stealthy every day carry in your wallet or money clip. Perfect for field work or lab work.PACKED WITH REFERENCE INFO: Never look up a basic engineering equation, physical constant or unit conversion again.EQUIPPED FOR TECHNICAL DRAWINGS: Always be ready to take a quick measurement or sketch a new design accurately with the ruler, protractor and angle drawing tools.NEVER OBSOLETE: Give a professional, student or budding young engineer a unique, thoughtful and practical gift that will stay with them for many years from homework to cutting-edge research.LASTS A LIFETIME: 0.5 mm thick laser-cut enamel-coated stainless steel built for a lifetime of use and abuse. Product Details: Material: Stainless SteelBrand: Genius Lab GearColor: BlackStyle: Basic,ProfessionalGraduation Range: 1/16 InchesIs Discontinued By Manufacturer ‏ : ‎ NoProduct Dimensions ‏ : ‎ 3.31 x 2.09 x 0.1 inches; 0.63 ouncesItem model number ‏ : ‎ TPE001Date First Available ‏ : ‎ September 5, 2019Manufacturer ‏ : ‎ Genius Lab GearBest Sellers Rank: #27,700 in Office Products (See Top 100 in Office Products) #89 in Drafting Tools & Drafting Kits#89 in Drafting Tools & Drafting KitsCustomer Reviews: 4.7 4.7 out of 5 stars 456 ratings