Try to buy from the official store or from official distributors
If buying from other store check the followings
If the arduino sold less than the standard price it is fake one
1)The original Arduino's color is generally a mix of green and blue and fake one have deep blue color
2)original SMD , Fake SMD
3)Original back side , Fake backside
4)FONT: original , fake (observe the "O" in both and see the difference)
5)LOGO: Original , fake, fake(Look for the sharp edges and the hole inside the 'A')
6)MADE IN ITALY: Original , fake , fake, fake
7)Connections and Connectors : Original , fake
8)Components: Original , fake
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The main difference between the original and clone of arduino is the fuse.The original uno has a gold color antifuse.In clone ,the antifuse has a name written as 5×5 and it looks green in colour.The fuse is located near the USB connector
The real Arduino Uno has a picture of Italy printed on it. I has never seen fake ones with this.
i have a fake one with italy picture on it
Also The fake or clones Ive seen dont have the word "arduino" printed on the pcb.
Buy direct from the manufacturer, an authorized retailer or merchant with an established name and reputation.
You will find every thing on the Arduino home page
Go to products and certified