A fresh pair of eyes on your work is invaluable — trust me. (lawyerist.com)
In addition to performing your own financial health check, it can pay (sometimes literally) to have a second pair of eyes on the situation. (pnc.com)
So basically, you should watch out if the translator works with or insists on a second pair of eyes on the text, that's always a good sign. (indiesgogerman.com)