When the water temperature is higher, the resistance value is lower. The lower the water temperature, the greater the resistance value. Working range: 0-120 degrees. Alarm temperature: 97 ± 2 degrees. When the water temperature reaches the alarm temperature and the alarm switch is closed, the alarm light will turn on. When the water temperature decreases and the alarm switch is turned off, the alarm light will be turned off. Response time is approximately 1 second when the alarm temperature is reached. The water temperature sensor has 2 wires: one connected to the water temperature meter to display the water temperature parameter, and the other connected to the alarm switch. Application: crude oil engine. Color: as shown Material: metal Size: 21mm Package Contents: 1 x Water Temperature Sensor Note: Light and different displays may cause the color of the item to appear slightly different from the real thing. Measurement error allowed is +/- 1-3cm.