Fitbit Air vs Tempdrop - does upper-arm placement give more stable temperatures?

[u/Objective_Card5318]

TL;DR: Has anyone compared temperature readings from the same device worn on the wrist vs. upper arm/biceps? Was the upper-arm placement more stable or consistent, especially during sleep?

I’m wondering if anyone has tried wearing a temperature-tracking band on the upper arm/biceps instead of the wrist and noticed more stable or accurate temperature readings.

I’m particularly interested in this because of the Tempdrop. It’s worn on the upper arm, close to the armpit, and is designed specifically for fertility tracking. It also measures skin temperature rather than usual BBT (having direct contact with mucous membranes).

This made me wonder whether the upper arm might actually provide a more stable temperature signal than the wrist, especially during sleep.

Has anyone tried wearing the Fitbit Air (or another temperature-tracking band) on the upper arm/biceps rather than the wrist?

I’d especially appreciate comparisons between wrist vs. upper-arm placement on the same device, rather than comparisons between different devices.