Is the HF35C or HFE35C too sensitive for your application? This Attenuator reduces sensitivity by a factor of 100 so you can measure stronger RF signals. This is a great emf radiation measurement tool as it will provide a more accurate number as you get closer to smart meter radiation. Changes sensitivity range from 0,1-1999 µW/m² to 10-199,900 µW/m² (equivalent to 0.001-19.99 µW/cm²). Need to go still higher" Stack as many as you like to achieve the desired range. Designed specifically for the HF35 series. This 20 decibel attenuator inserts between antenna and meter body.