If you are looking for the best cheap coffee scale then you have to consider the Jennings CJ4000 ( http://amzn.to/2jxuPf4 ). This scale sells for about $25 and it’s a proven top pick. I’ve had mine since January 2012 and I’ve used it thousands of times and it’s still holding up well.
The biggest downside is the lack of precision — this is a 0.5g increment scale, not a 0.1g one. The 0.1g version is the CJ600 ( http://amzn.to/2BkVT91 ).
This scale is known for its simplicity, reliability, and accuracy. It’s a bit on the large side, it’s a bit ugly, and it’s not waterproof, but it’s served me very well.
The CJ4000 is the best coffee scale under $30 and probably the best under $50. If you want to spend more, most people (myself included) recommended the Acaia Pearl ( https://www.youtube.com/watch?v=2VV66j9BGM0 ).
More reading: https://coffee-scale.com/
note amazon links are affiliate links