This digital temperature controller is suitable for household freezers, water tanks, refrigerators, industrial chillers, boilers, steam ovens, and various temperature control applications. It is easy to use and operate. Features: - Mini temperature controller with a large, clear LED display for improved readability - Switching modes between cooling and heating - Temperature control by setting the temperature set value and differential value - Temperature calibration and refrigeration control output with delay protection - Alarm function for temperature limit exceedance or sensor error to enhance safety - Wide temperature measurement range from -50 to 99 degrees - Temperature resolution: 0.1 degree - Accuracy: ±1 degree (-50 to 70 degrees) - Sensor error delay: 1 minute - Power supply options: 12V, 24V, or 110-220VAC - Low power consumption