Piezoelectric pressure sensors are based on the piezoelectric effect, converting the pressure on the sensor surface into electrical signals for pressure measurement. They have wide dynamic range, high temperature resistance, and can measure high-intensity sound pressure in harsh environments, ensuring the accuracy and reliability of data. There are two models in this series, HT2121 and HT2123, which have different signal output types. The former outputs voltage signals, the latter outputs charge signals, and the latter is more resistant to high temperatures than the former.