The best alternatives to MeasureMate are PixelSnap, CSS Scan, and Dimensions. If these 3 options don't work for you, we've listed a few more alternatives below.
A tool for designers to measure screen dimensions
This extension measures the dimensions from your mouse pointer up/down and left/right until it hits a border. So if you want to measure distances between elements on a website this is perfect. It doesn't really work with images because there the colors change a lot pixel to pixel.
Primarily used as a time saving tool, to assist new or experienced designers and coders, Abaci’s aim is to provide a simple base from which to form font / type style guides used in brochures, websites and digital applications. It creates 6 heading styles that work harmoniously together, based on an initial single selection by the user.