There’s lots of debate about how accurate a set of scales can actually be — especially when it’s promising, as these scales do, to measure as many as 13 very specific details, including subcutaneous fat, visceral fat and muscle mass. But ultimately, the information they provide is a reference point, and as long as you try to keep as many factors constant as possible, you’ll get an idea of whether you’re heading in the right direction. So as well as keeping the scales in the same place, on a hard, flat, level surface, it helps if you weigh yourself at the same time of day. The best time is first thing in the morning, before eating or drinking anything. Because scales like these use a technology called bioimpedance, where the amount of fat and muscle is estimated by running a weak electric current through the body, even something as simple as drinking a glass of water before you step on the scales can affect the readings, so keep it consistent.