Why doesn’t my watch measure wrist temp

Ahi_biomed, Ok so are you saying you do not see Wrist Temperature Under Body Measurements in the iPhone Health App? That measurement is a BaseLine temp that is taken from wearing the watch in bed for minimum 4 nights straight. The measurement you see is any deviation from that baseline. If you open up Wrist Temperature and scroll down to Show All Data it will show you all the Recorded Data from the nights you have worn the watch. Click on one and it will show actual Wrist Temperature including Start and End times the watch recorded during the night.

So if you can answer my first question "Do you not see the Wrist Temperature Under Body Measurements"? , maybe we can go from there. Here is screenshot night sample of my Wrist Temperature under All Recorded Data.

Hello Ahi_biomed, Have you followed the steps in this Apple Support Page?

Track your nightly wrist temperature changes with Apple Watch - Apple Support

Ahi_biomed, Ok, Check on your watch Settings > Privacy & Security > Health > Wrist Temperature and make sure it is turned ON.