The heat meters are designed with longevity in mind and IP68 waterproof and dustproof ratings. They are encased in rugged aluminum alloy or stainless steel. The electronic module uses temperature-compensated components and the ultrasonic transducers are encapsulated to protect against corrosion from water impurities. They undergo field tests in China’s northern harsh winters (-30°C to +85°C) to demonstrate stable operational performance over decades, making them ideal for long-term use in demanding heating environments.