MonitorPro LoRa sensors are produced using advanced circuitry meaning that the accuracy is very stable and will remain within the stated 1˚C deviation. Calibration is best checked by comparing sensor data to a thermometer temperature reading using a glass of water that has been in the fridge for at least 2 hours (or ice pick method for freezer). If a sensor is not reading within 1 degree deviation return to MonitorPro for repair under 1 year warranty.