Are smart scale body fat readings accurate?

The consensus across the reviewers we read, including specialist fitness communities that compared scale readings to DEXA scans, is that bioimpedance body-fat percentages are unreliable in absolute terms. Multiple high-trust community threads reported readings stuck in a narrow range or off by up to 10 percent. What these scales do well is track consistent trends over time using the same device, which is how most reviewers recommend using them.