[unpaid advertising because product test] The Apple Watch Series 4 is the first really bigger and optical upgrade of the smartwatch since the product launch in 2015. With improved optics with a borderless display, a more robust housing and, above all, more sensors for measuring fitness activity, the new Apple Watch a real challenger among sports watches. We will the Apple Watch Try 4 stainless steel silver and put the sports watch through its paces. The big product test in detail Apple Watch 4 test protocol.