What kind of scal do you use to weigh coins

What kind of scal do you use to weigh coins?
Since i have been told that the weight of a coin is a good indicator to see if it is real or not i will have to buy myself some scale.
But what is a good (affordable) one?

 

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I buy the low end ones off ebay. They last a year or so and I get a new one.

 

I couldn't find one for the longest time that went down to 0.1 grams. I ended up buying one at a head shop.