Charter speed test officially called Charter Communication Nationwide Speed test, is one of the most accurate tools to measure your internet speed.
https://www.charterspeedtest.info/
Now, it is also known as Spectrum speed test.

The best thing about this tool is that it is free. While most of the other speed checking tools are premium. This means that you have to pay to use the service. Charter internnet speed test provides you a complete report of your internet speed within few minutes.

No matter wherever you are located in the globe, you can use the service for free.