The Pocket Scientist High School Ed. - STEM Ruler

Master science fundamentals to prepare for any career in STEM. STEM ESSENTIALS LASER-ETCHED INTO A WALLET-SIZED STAINLESS STEEL CARD: 14 helpful unit conversions, 26 essential equations, and 13 common physical constants to save time doing homework and reinforce critical concepts. Doubles as a wallet ruler, compass and protractor. Photo scale ruler to calibrate length in experimental images. Periodic table, pH scale of acids and bases, plus full trigonometry reference angles Here's how to use me!   Free shipping in the USA! Typically arrives in 5-15 business days in the USA, 10-42 days internationally. Standard shipping (with tracking) available for about $3 in USA (3-7 day). We ship to Canada, the UK, EU and many other countries around the world. Go to checkout to see the rates and availability for your region. Still not sure if you want one? We offer free returns of this product within 30 days of purchase if you're not happy with it! Grab it today with no risk and feel the diff