When the job is done and you’ve installed a new electrical outlet, you need to test it. A GFCI Receptacle Tester like this one http://amzn.to/2ALVVHu is what I use. This tester will tell you if you’ve wired an outlet correctly and if you didn’t, it will tell you what is wrong. The GFCI tester has the benefit of testing GFCI outlets.
I hope you found this list of home improvement electrical tools helpful and I’m certain you will find all of the tools indispensable on your next project!