If you don’t carry a multi-tool, you can’t imagine when or why you’d ever use it. But once you have one you love, you pull it out seven times a day.We’ve tested more than 30 multi-tools in rural New Hampshire — fixing fences, slicing hay-bale twine, and even assisting in the birth of a lamb on a cold March morning. And, for years, the Leatherman Skeletool CX has stood out as the best.