We've had the stainless-steel Apple Watch and aluminum-bodied Apple Watch Sport for less than a day, and as we promised in a story from this morning, some early results are already coming out of our labs. Today, we subjected several of Apple's smartwatches to durability testing using a water-immersion tank and a scratch-resistance test for the screens. We also tested the fitness features, including step-count and heart-rate monitoring accuracy. You can see some of the results in the video, above.

Still to come, we'll have detailed results on the functionality of both models, including readability of text in darkness and bright light, ease of pairing, and various other usability tests. Also, the Apple smartwatches are undergoing user-experience testing with volunteers to see how non-engineers feel about the devices. We'll include results from all of these tests when our complete smartwatch Ratings—with the Apple Watch and several other brands—post next week.

—Glenn Derene

