Don't think that'll be very good TBH. Those things are quite slow to react and you'll probably be well beyond the indicated temperature. Best thing is to use your hand. Stop steaming when the jug gets uncomfortable to hold and you'll be around 65deg. You can calibrate yourself against a regular steaming thermometer, but make sure that is calibrated properly in boiling water as they are not the highest quality scientific instruments in the world.
Don't think that'll be very good TBH. Those things are quite slow to react and you'll probably be well beyond the indicated temperature. Best thing is to use your hand. Stop steaming when the jug gets uncomfortable to hold and you'll be around 65deg. You can calibrate yourself against a regular steaming thermometer, but make sure that is calibrated properly in boiling water as they are not the highest quality scientific instruments in the world.