The power of the incubator is about1000 W W. According to the voltage of 220V, the resistance is the square of the voltage divided by the power. Then the resistance is about 48.4 ohms. Therefore, the incubator sensor is not universal.

Automatic kettle is a brand-new tool for boiling water. It has a very sensitive sensor. When the water boils, the steam is relatively large, and the power supply can be automatically turned off through the sensor.