"The 82AD is a modulation meter from Boonton. Modulation meters measure degrees of modulation in a modulated signal.","Additional Features:","Frequency modulation ranges of 10, 100, and 300 kHz full scale, with accuracy of ±2% of reading for deviations up to 300 kHz and modulation frequencies between 30 Hz and 100 kHz. RF input sensitivity of 10 mV RMS (10 to 520 MHz) and 30 mV RMS (520 MHz to 1.2 GHz). 4 digit LED display."