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 turn 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: Golden. Material: Metal. Size: 21mm. Package includes: 1 x Water Temperature Sensor. No other items included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: ±1–3 cm.