The T7047C-2007 Honeywell Rempte Sensor is accurately calibrated at the factory. It cannot be field calibrated. This remote sensor control element is a negative temperature coefficient thermistor, so as the room temperature increases, the resistance of the thermistor decreases. Use caution when setting tempertaure below 40 degrees F. With 1420 ohms at 75 degrees, this sensor operates at an efficient level. Order Honeywell’s T047C2007 for optimum temperature control!