Ultrasonic level sensors don’t measure by color, transparency, or gloss. They rely on acoustic echo.
Water, oil, glass, and metal usually reflect sound well. Powders and grains need more care because of dust and uneven surfaces. Foam can absorb sound. Vacuum tanks are unsuitable because sound needs air.
Visual guide + more details:
https://issrsensor.com/what-materials-suit-ultrasonic-level-sensors/
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