AS 950 is an Analog Meter which displays signal strength, frequency, channel number & VA on the LCD screen,AS 952 displays all the features of AS 950 with additional features of Optical level & Digital level,Sharp Vision Field Strength Meter AS 952 is a "3 in 1" DB Meter for complete trouble shooting in the field, be it DIGITAL, OPTICAL or ANALOG signal. AS 952 goes from Analog mode to Optical & Digital by press of front panel switches.