The principle of a Radar Level Meter is based on Time of Flight (ToF) technology. It emits high-frequency electromagnetic waves (typically microwaves) toward the material surface. These waves reflect off the surface and return to the sensor. The device calculates the distance to the material by measuring the time delay between the transmitted and reflected signals. This distance is then converted into a level measurement. The non-contact method ensures accuracy and reliability, even in challenging conditions like foam, vapors, or extreme temperatures.