The answer to this question is surprisingly simple. It is the key or tool designed to work with the specific electric utility box in question. However, it should be noted that there are indeed many key and lock combinations around the country. That is why you must work with an experienced barrel lock professional when ordering this type of key. Getting the wrong key and then trying to open an electrical meter box could spell disaster. This can often result in a damaged meter box and and damaged meter tool. Most electrical meter boxes have an identifying number that will match to a corresponding tool. Work only with pros that match these numbers as a way to ensure that you get the right electrical utility box meter tool for your particular job or project. .
Barrel Lock Blog
A regularly updated blog on all matters related to barrel locks and barrel lock meter keys.