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<p>[QUOTE=&quot;chrisild, post: 1206718, member: 39&quot;]Depends on the machine. Most modern vending machines check insterted coins for various criteria: size and weight for example but also whether they are magnetic, &quot;a little magnetic&quot; or non-magnetic. How sophisticated such machines are also depends on what coins are used in a country. Here in the euro area we have €2 coins for example, and some people used 10 baht coins from Thailand, or 1 lira coins from Turkey, in vending machines. Both resemble the €2 piece but are worth less; older machines would not recognize the difference.</p><p><br /></p><p>Modern vending machines may also check inserted coins for thickness, conductivity or contact resistance. Some can even recognize characteristic design elements which of course means their software needs to be updated regularly. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /> So quite a lot can be done - the primary questions are, what products can be purchased at a specific vending machine, and what is the highest denomination that the machine accepts? A chewing gum machine that accepts quarters only will not have to be as &quot;clever&quot; as a machine that sells electronic gadgets and swallows coins worth ten times as much ...</p><p><br /></p><p>Christian[/QUOTE]</p><p><br /></p>

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