The Galaxy Ring from Samsung offered the best features tested. In combination with Android smartphones, it even provides GPS and altitude data for sports recording. The heart rate measurement is accurate - and the best in the test - and the sleep analysis is good. However, there is still room for improvement in terms of data protection. And: iPhone users are left out.

Samsung's first Galaxy Ring is impressive: it sits well on the finger, is barely noticeable and looks smart. The recording of health and fitness data is accurate and runs conveniently in the background. There is no display that constantly cries out for attention. So if you're happy to check your fitness values on your mobile phone every now and then and be alerted by mobile in an emergency, you no...