Grades from good to poor: we show which smartwatches and fitness trackers measure best in the test, have the smartest features and last a long time. New in testing: 21 new devices were added in November: 18 smartwatches and 3 fitness trackers. These include, for example, the Apple Watch Series 8, the Garmin Fenix 7, the Samsung Galaxy Watch5, but also much cheaper smart watches such as the Huawei...