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The Grove- Piezo Vibration Sensor is suitable for measurements of flexibility, vibration, impact and touch. The module is based on PZT film sensor LDT0-028. When the sensor moves back and forth, a certain voltage will be created by the voltage comparator inside of it, outputting at high & low levels. It has a high receptivity for strong impacts, and a wide dynamic range (0.001Hz~1000MHz) guaranteeing an excellent measuring performance. You can easily adjust its sensitivity by adjusting the potentiometer with a screw.