The TS3021U Digital Temperature Switch is designed for many heating and cooling applications. The probe temperature is displayed on the bright 3-digit, red LED display. Program 12 different parameters including set point, hysteresis, cycle time, and ambient probe adjustment using the tactile front keypad. The unit features error and alarm messaging and password protection. The TS3021U includes a thermistor with 1.5 meter (5 ft) cable, fitting clips for panel mounting, and instruction manual.