Avoid installing the sensor near pools, spas, or other bodies of water. Water sources as they may impact humidity accuracy. Mount the sensor at least 5 feet (1.5 meters) off the ground in an open area. Higher is better for wind measurement. The rain gauge on the sensor is calibrated at the factory. If you choose to verify accuracy of the gauge before mounting, the video below will assist you with the drip test. Please let us know if you have any other questions. Thank you.