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Installed on the outside of the tank bottom, it emits ultrasonic signals from the bottom, which are reflected back when encountering the oil surface. The liquid level height is then calculated based on time and speed. Meanwhile, combined with our company's unique digital signal processing technology, it overcomes the influence of the container wall, thus achieving high-precision non-contact measurement of the oil surface. No drilling is required on the tank, and the tank structure remains undamaged.