1. The area you are placing the test kit holds utmost importance. So, one must be sure of where and how they are using the detector or kit so as to get the best possible results. Radon is a heavy gas settles in the lowest levels of your house which is why it's always recommended to start testing from the basement or ground floors.
2. Detectors should not be placed in humid areas or regions where there are chances of fluctuating airflow. The device must not be moved on and off else results may vary from the actual numbers.