The ZNHW-II intelligent constant temperature controller adopts a computer chip as the main control unit, multiple digital filtering circuits, fuzzy PID control algorithm, self-tuning function, high measurement accuracy, small temperature surge, single key touch operation, dual screen digital display, thyristor control output, 160-240V wide voltage power supply, and has a break protection function. The shell is injection molded in one go, with the advantages of beautiful appearance, easy operation, lightweight and flexible. It is an ideal instrument for controlling heating devices such as electric furnaces and electric heating sleeves for accurate temperature control and heating tests.