Ultrasonic material level meter: Using the principle of ultrasonic reflection, the transmitter sends ultrasonic pulses to the material surface, and the receiver calculates the time difference after receiving the signal reflected from the material surface, thereby determining the height of the material.

Radar level meter: Using microwave technology, it emits continuous waves or pulse waves to the material surface, and calculates the distance by measuring the time delay of the reflected waves.

Capacitive material level meter: Based on the principle of capacitance change, when the material contacts the sensor, the dielectric constant between the two plates is changed, which in turn causes a change in capacitance to determine the position of the material.

Mechanical material level meter: such as rotating vane type or float type, which relies on direct contact between mechanical parts and materials to sense the presence or absence of materials and height changes.

Radio frequency admittance level meter: uses radio frequency current to measure the admittance value of the material to the probe to detect the material level.