The Model 120-10 Field Strength Meter is a compact, light-weight portable lnstrument for the measurement of a wide range of radio signal intensities in the radio-broadcast band from 540 fo 1600 kilocycles, Its range of sensitivity, from 10 microvolts per meter to 10 volts per meter, makes it equally effective for interference studies at low signal strength and for close-in measurements on high-power directional arrays.