The sensor returning 20 means that no valid value was detected. The sensor is used on the snow, it may be that the probe is frozen and the ice block affects the detection
The sensor returns 20, which means that no valid value is detected. When the sensor is used in snow, it may be that the probe has frozen ice, which affects the detection
The sensor returns to 20, which means that no significant value can be detected. When the sensor is used in the snow, it may be that the probe freezes the ice and affects the detection.