Apple Watch Series 12 review: accurate heart rate, Readiness score

The Apple Watch Series 12 review highlights the new Health sensing system with ring-arranged green LEDs and the S11 chip, delivering the most accurate optical heart rate monitor the reviewer has tested. Prices start at £369 for the 42mm aluminium model and £419 for 46mm, with titanium from £649 and ceramic from £849; all models use Ceramic Shield 2 glass. A Readiness score debuts, but battery life remains one to two days.

• Pricing: £369 for 42mm, £419 for 46mm, titanium from £649, ceramic from £849
• Heart rate sampled every 5 seconds, HRV every 5 minutes
• Ceramic Shield 2 glass across the range replaces Ion-X
• Battery life still only one to two days