All parts have been carefully selected, the working performance is more stable, the measurement error is small, and the accuracy is high. It is a fully intelligent control system suitable for most users to use in various heating/cooling equipment in different environments. Simple to operate, its temperature measurement and temperature control is accurate with strong antiinterference ability. Using modern heating technology, the smart thermostat is small in size, light in weight, easy to carry, and does not take up space. With the permanent memory function of the set parameters, it is suitable for water quality testing, aquaculture, and industrial temperature control. How to Use: Power key: it is the reset key, press this key once in the setting state to exit the setting state and return to the display state. S key: it is the setting key, press the S key for 3 seconds to enter the program menu code mode, and the code P0 H is displayed. Continue to lightly press the S key to cycle to select the parameter code of P0 HP1 32.0P2 0.0P3 0.5.