GH-NB981 sonar liquid level meter is a new high-precision measurement product with non-destructive testing, nano-velocity measurement and micron calibration technology developed by our company. The liquid level measurement adopts the sensor external mounted type and non-contact measurement mode with the measured liquid to achieve complete isolation measurement in a real sense. The sonar liquid level meter is installed outside the tank body, which can continuously measure the liquid level outside the tank body without opening holes to realize the installation without stopping production. It is especially suitable for accurate measurement of all kinds of toxic substances, strong acid, strong alkali and all kinds of pure liquid level in closed containers. The instrument adopts explosion-proof design and is widely used in explosion-proof occasions. (Note: GH-NB981 sonar level meter directly replaces servo level meter, ultrasonic level meter, radar level meter, differential pressure level meter, etc., with higher measurement accuracy and better stability coefficient).