This liquid pressure sensor is composed of high-precision pressure cores. A pressure measuring device with high resolution, high reliability, and high precision, suitable for pressure measurement of non corrosive gases and liquids compatible with ceramics and stainless steel. Imported insulating rubber and zero temperature drift transmission fluid are used. Using special techniques for high-precision full temperature calibration. It can be well used for various water level detection. Especially suitable for application fields such as white goods, medical electronics, consumer electronics, automotive electronics, inflatable devices, etc.