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[http://www.ultrasoundprobes2016.com/Spo2-ExtensionAdapter-Cable/  Spo2 extension cable] Probe used in the ultrasonic detection is the use of piezoelectric effect materials to achieve energy , acoustic energy is converted transducer . The probe is a key component of the wafer , the wafer is a single crystal having a piezoelectric effect or polycrystalline thin , it is the role of acoustic energy into electrical energy with each other .