SBE56 is a low-power, high-precision temperature recorder that uses internal batteries to record temperature and time data. It has a 0.5-second time constant pressure-protected thermistor that provides excellent accuracy and resolution, and can take rapid samples at a frequency of 2Hz. It has excellent stability; drift typically less than 0.002° / year. Equipped with 64 MB memory, high-precision real-time clock, and the depth of the pressure-proof plastic housing can reach 1500 meters. The user interface is a USB 2.0 interface, with easy-to-use Java communication software, which realizes data upload, data conversion and other functions, and is suitable for all computer operating systems.