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 turns on. When the water temperature decreases and the alarm switch is turned off, the alarm light turns off. Response time is approximately 1 second when the alarm temperature is reached. The water temperature sensor has 2 wires: one connects to the water temperature gauge to display the water temperature parameter, and the other connects to the alarm switch. Application: crude oil engine Color: as shown Material: metal Size: 21mm Package Contents: 1 x Water Temperature Sensor Only the above package content is included; other items are not included. Note: Lighting and different displays may cause slight color differences between the item and the image. Measurement error allowance is ±1–3cm.