Trending on X· Sep 9, 2026

MKBHD Highlights Apple Watch Series 12 and Ultra 4 Sensor Upgrades Amid Unchanged Designs

A post by Marques Brownlee (@MKBHD) is trending on X · Apple Watch sensor upgrades · 622 likes

Tech reviewer Marques Brownlee (@MKBHD) posted that the upcoming Apple Watch Series 12 and Ultra 4 keep the same exterior designs but introduce new silicon and improved sensor arrays enabling far more frequent heart-rate monitoring—background HR every 5 seconds (60× previous) and HRV every 5 minutes (24× previous). Apple is claiming this makes it the “most accurate heart rate sensing in a wearable.” The post is trending due to MKBHD’s large following, high engagement (100k+ views, 1k+ likes), and interest in Apple’s annual hardware refresh cycle and health-feature competition.

Marques Brownlee

@MKBHD

Apple Watch Series 12 and Ultra 4 have the same designs, but new silicon and improved sensor arrays for WAY more frequent heart rate polling Background heart rate reading every 5 seconds all day long (60x more than before) HRV every 5 minutes (24x more frequent than before) Apple is now claiming it's the “most accurate heart rate sensing in a wearable” 👀

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