1.Use alcohol to sterilize the head of sensor before use; 2.Press the power button, pay attention to the notice; 3.The display shows the last result and last 2seconds, then ºC flickers on the screen, which means it is ready to test; 4.Put the head of sensor to test site, temperature rises slowly. If the temperature keeps the same for 16seconds, ºC sign stops to flicker and test finishes; 5.Thermometer would turn off automatically if power off button has not been pressed again.