Measuring Box is a free Chrome add-on developed by jonny_spry that serves as an on-the-fly measuring tool for web elements. It falls under the Browsers category, specifically in the Add-ons & Tools subcategory.

With Measuring Box, users can easily determine the size of elements or images on any website. The tool allows users to click and drag their mouse over an area of the webpage to measure the content underneath. By doing so, users can obtain accurate measurements of the length and width of web elements.

In addition to providing measurements, Measuring Box also displays the aspect ratio of the selected area. This feature is particularly useful for designers and developers who need to ensure that their web elements maintain the correct proportions.

Overall, Measuring Box is a convenient and straightforward tool for quickly obtaining measurements and aspect ratios of web elements. Its click and drag functionality makes it intuitive to use, and its compatibility with any website makes it a versatile tool for various web-related tasks.