Stick it in a saucepan of warming water with your jam thermometer and see when it switches - add a couple of flying leads first and connect a meter on continuity or batteries and a lamp in series with the otter switch if you don't have one.
Make sure the otter switch head is immersed and not in contact with the pan at all.
Probably somewhere in the range of 82 - 98C.
Only rely on the rising switch action not the falling temperature (hysteresis) and do at least 3 runs for a mean.
If I had to guess it would be 88C.
Last edited by 4/4sportsfun; 05/05/16 06:46 PM.
