This symbol indicates that the measured radon concentration in your sample was less than the detector’s Lower Limit of Detection (LLD). For many kits that have a very low reading, this basically means that your radon levels are so low that we cannot give a precise result, though we can say with certainty it is at or below the report result!
For more information about the LLD and what it means for your results, please visit our webpage.

Category: Analysis & Results