A smart ring measures pulse and skin temperature, counts steps and determines sleep quality, among other things. In this respect, it is similar to a smartwatch. But it is smaller, lighter - and less conspicuous. After all, not everyone likes to wear an occasionally vibrating mini screen on their wrist, preferring a conventional wristwatch - if they wear one at all...

The Galaxy Ring is the best ring tested. In combination with Android smartphones, it even provides GPS and altitude data for sports recording. The heart rate measurement is accurate - the best in the test - and the sleep analysis is good. However, there is still room for improvement when it comes to data protection. iPhone users are left out.