Gadget that measures stress levels

I am looking for some personal gadget that will measure stress levels constantly while it's being worn. The idea is to alarm me that me stress levels are high before I realise that myself (and before spiralling).

I tried the Garmin vivosmart 4. Maybe I have a monday model, but it just does not alarm me to high stress levels, even though it shows at the end of the day that there were spikes.

So basically, I don't want to learn when my stress levels are higher than usual at the end of the day or after an event (to learn more about what triggers me or whatever), but a real-time alarm.

Does any such device exist?

Tia!