... Clocks,Calculators,Telephones,Washing machines,Various(Burglar alarms,etc)2. For transduction: Embryo monitor,Heart reflectoscope reflector,pedometer ... with bare hand because electrode may be corroded.2,The component may be damaged if mechanical stress ... procedure is proceeded and monitored in our factory. 2, Features of our products is with extremely clear ... for the past 21 years. Piezo disk