I don't think we're allowed to post links here so I'll just copy and paste what I bought off a well-known E-Retailer
On someone's recommendation I bought: American Weigh Signature Series Black Digital Pocket Scale, 1000 by 0.1 grams
It's plastic and feels a little fragile but works well. I have no complaints. It's the size of a checkbook so you could take it to a coin show no problem.
I would also recommend you pick up a Loupe for looking at the details of coins. I bought a Bausch & Lomb first(supposedly the best) I struggled with the small viewing area and it wasn't working for me(maybe I don't have enough experience)
I returned it and went online and bought this BelOMO 10x Loupe, made it Bellarus of all places, because people said it had a large viewing angle. It was a great purchase for half the cost of the Bauch & Lomb, I'd highly recommend it. Very easy to use and a large crystal clear viewing area.