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Where do you get a coin balance? Not from me, since I’m still waiting for the world to make a machine that instantly converts Sketchup designs into real products. That day is not far off, but it’s not here yet.
So if you want one, you can make one. Easily. Probably out of a wooden stick, like say a ruler.
Here’s an article about detecting counterfeit coins that I pulled up on a search. By the way, I own a Fisch set, and if you get it you probably won’t need to build your own balance. But they cost about $200+, just so you know.
Do I need to say this? “I am not responsible for any counterfeit coins you might inadvertently obtain.” Now let me go back to worrying if my own coins are real.
Engineer Zero 
I didn’t make the hand. I downloaded it from Google 3D Warehouse. I would give credit but it was anonymous. I notice that some people ask for credit if you download their stuff and I apologize if I haven’t done that in the past. I will strive to make sure I do it in the future.
What’s wrong with me? I didn’t make the butter knife either. I think that was anonymous too however.