A BTU (British Thermal Unit) meter is a precision device used to measure the amount of thermal energy consumed in heating or cooling systems. It calculates energy usage by measuring the flow rate and temperature difference between the supply and return lines. BTU meters are essential for HVAC systems, district cooling networks, and industrial energy management, helping businesses optimize energy efficiency and reduce costs. These meters are available in various types, including ultrasonic, electromagnetic, and mechanical BTU meters, ensuring accurate and reliable performance.