I believe that what you’re looking for is called a “spectrum analyzer”. You’ll need a calibrated antenna, too.
I’m guessing that SAR (specific absorption rate) is usually measured with a block of soggy flesh-imitating goo that’s set up as a calorimeter, though. You could look up how the FCC defines SAR, perhaps.
I’m guessing that SAR (specific absorption rate) is usually measured with a block of soggy flesh-imitating goo that’s set up as a calorimeter, though. You could look up how the FCC defines SAR, perhaps.