When we test on mobile it can be difficult to choose what devices to test on and buying them all can be expensive and inefficient. Developer tools can be really helpful when we are testing mobile websites, because they enable us to explore the UI of a mobile website on a number of different sized displays. The Safari web inspector is a really useful tool that is included as part of the Safari web browser. Learn how to use it in order to help super charge your mobile web testing on iOS and OSX.