How Do Vending Machines Detect Fake Coins? This machine can decipher coins with pinpoint accuracy. Light sensors measure the size while electromagnets detect the metal type of the coin. Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts James Cameron’s Deep Dive Attempt Detailed Tour of the International Space Station How NASA Reinvented The Wheel – Shape Memory Alloys Elon Musk Speech – ‘The Dumbest experiment In History’ How Does The Internet Work and Connect Around The World? Did You Know Any Object Can Levitate Magnetically?