Useful for quick measurements, when you need to measure between several elements at once there's Tape: https://chrome.google.com/webstore/detail/tape/jmfleijdb

Useful for quick measurements, when you need to measure between several elements at once there's Tape: https://chrome.google.com/webstore/detail/tape/jmfleijdbicilompnnombcbkcgidbefb https://chrome.google.com/webstore/detail/tape/jmfleijdbicil... And if you just want a box that can be dragged around there's Page Ruler: https://chrome.google.com/webstore/detail/page-ruler/jlpkojjdgbllmedoapgfodplfhcbnbpn https://chrome.google.com/webstore/detail/page-ruler/jlpkojj...