humidity meters Belgium

... main users of ultrasonic detectors, which serve as proximity or presence sensors. They utilize the principle of measuring the time of flight of sound in the air. The speed of sound in air is approximately 6 ms/meter (round trip). Compared to other technologies, ultrasonic technology is highly efficient. It operates in dusty environments, and sound is reflected by most surfaces. Thus, it does not depend on the structure, color, or surface of the material to be detected. Dust, light, and humidity do not...