The machine is small in size, simple in operation, reliable in performance, and can be set at any time from 1 minute to 24 hours according to requirements.The water-immersion sensor tracks and records the data in the tested environment throughout the whole process, and has a long recording time and has automatic storage and protection function for power-off data.The whole machine consumes little power and uses a built-in battery, which can be powered for up to half a year.