When looking for a thermometer, check the range and temperature accuracy of the product. The accuracy of temperature also depends on how far the sensor is from the thermometer. Most of the sensors work great for up to 100 feet and can easily cover the space of a house. Readings of most of the thermometers fluctuate by 1-2 degrees, and it’s not a significant change. You need to install the thermometer and outdoor sensors at a proper distance and in the shade for the most accurate results.