The radar water tank level meter operates by emitting a narrow microwave pulse, which travels at the speed of light in space. When the pulse encounters the surface of the measured medium, a portion of its energy is reflected back and received by the same antenna. The time interval between the transmitted pulse and the received pulse is directly proportional to the distance from the antenna to the surface of the measured medium. Due to the extremely high propagation speed of electromagnetic waves, accurately measuring the small time interval between emission and reception pulses, which is on the order of nanoseconds, poses a challenge. However, with advanced technology and precise timing mechanisms, this level meter is capable of achieving accurate and reliable measurements in real-time.