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External Level Meter measures level by sonar distance measurement. Since it adopts technology of micro vibration analyze, the product do not need holes on tank wall or flange for mounting. During the whole measurement process, the product will not contact medium liquid or gas in tank, thus could be installed and maintained easily. Normally the transmitter shall be installed near the tank while sensor is mounted on tank wall. The level value will be measured by sonar echo signals that being sent and received from the sensors through the tank wall.