Piezoelectric ceramics is a kind of synthetic piezoelectric material. When subjected to external pressure, charges will be generated on both sides, and the amount of charges is directly proportional to the pressure. This phenomenon is called piezoelectric effect. Piezoelectric ceramics have piezoelectric effect, that is, they will be deformed under the action of external electric field, so piezoelectric ceramics can be used as sound elements. Using the piezoelectric effect of piezoelectric ceramics, it can be judged by multimeter. Lead out two wires from the two poles of the piezoelectric ceramic sheet, then lay the ceramic sheet flat on the table, connect the two wires to the two probes of the multimeter respectively, set the multimeter at the minimum current level, and then gently press the ceramic sheet with a pencil eraser. If the multimeter pointer swings obviously, it means that the ceramic piece is intact, otherwise it means that it has been damaged. "Zhigao Instruments specializes in: analytical instruments, scientific instruments, optical instruments, experimental instruments, nondestructive testing, electronic measurement, industrial control, automation, power equipment, pressure, liquid level, flow rate, temperature, calibration, correction, sensors, transmitters, analyzers, testers, detectors, chromatography, spectroscopy, electricians, oscilloscopes, thermometers, flowmeters, acids. Multimeter, water quality analysis, oscilloscope, thermal analysis, spectrophotometer, electrochemistry, low temperature, surface, specific surface, portable, diffractometer, acidity meter, COD determination, balance, element analyzer, test box, ultrasonic, industrial computer, aging box, thickness gauge and other products. Address: Room 729, West Tower, Century Square, Dongbin Road, Nanshan District, Shenzhen City, Guangdong Province.