Weight tapes have always entailed a tradeoff: They’re portable and easy to use, yet they aren’t especially accurate. But a study from Scotland shows that—used properly—a weight tape can be helpful for managing a horse’s condition and protecting his health. University of Edinburgh researchers worked with a British feed company to investigate the utility of weight tapes. The researchers reviewed the records from 1,716 horses seen by the feed company’s consultants over a two-year period. Find out what they learned.