UZD series products are suitable for liquid level measurement of various underground storage tanks and unsuitable open side containers. The change in the liquid level in the container is reversed by the magnetic steel on the top of the connecting rod to drive the magnetic beads in the indicating panel. The level gauge does not require on-site power supply, it is safe, clear indication, and is an ideal instrument for level detection. This product is suitable for a variety of measurement media, such as water, liquefied gas, propylene, liquid ammonia, dilute acid, alkali salt, as well as heavy oil, tar, etc. It can be used with UQZ or UCZ bundled remote transmission transmitters to output 4-20mA remote transmission signals. It can be equipped with upper and lower limit liquid level alarm switches to achieve upper and lower limit liquid level alarm and control.