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Apple Watch Series 12 and Ultra 4 review: More personal than ever before

The Apple Watch Series 12 and Apple Watch Ultra 4 are all about what’s happening underneath. Headlined by a new Health Sensing System, they bring some of the biggest improvements to Apple Watch health tracking in years.

I’ve spent the last week with the Apple Watch Series 12 and Ultra 4. Here’s everything you need to know.

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Apple Watch Series 12 makes a big change to a small complication that I’m excited about

Apple Watch Series 12 is a major upgrade to the core health and fitness tracking wearable. That’s because of the new Health Sensing System that includes an even more capable heart rate monitor.

The new hardware doesn’t just extend to more accurate health data. There’s a big change to a small complication that I’m seeing in Apple’s marketing material. It’s just one thing I’m excited about with the new Series 12 and Ultra 4 models.

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Apple shares the data behind Apple Watch Series 12’s biggest health claim

Apple makes a bold claim when it comes to Apple Watch Series 12 and Apple Watch Ultra 4. According to Apple, the new Health Sensing System on both watches “delivers the most accurate heart rate sensing in a wearable.” Apple backs up this claim with a new study that shows how Series 12 heart rate sensing compares to other leading wearables, including smart rings and fitness bands.

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