Which tool is commonly used to measure the temperature of livestock?

The thermometer is the correct tool for measuring the temperature of livestock. It provides a direct and accurate reading of the animal's body temperature, which is crucial for assessing their health. Monitoring body temperature can help identify signs of illness or stress. Livestock, like cattle, sheep, and swine, typically have a normal body temperature range that can vary by species, and any significant deviation from that range can indicate a health issue that may require veterinary intervention.

While pressure gauges measure the pressure of gases or liquids and stethoscopes are used to listen to internal sounds of an animal's body (like heartbeats), and scales are designed for weighing animals, none of these can assess body temperature. Thus, the thermometer is specifically designed for this purpose and is essential for maintaining animal welfare and proper management in livestock care.