The Pocket Engineer - Wallet Engineering Ruler Scale and Unit Conversion Reference 3 inch

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.