FC-3000 frequency counter: 1.Freq:max.3.7GHz 2.RPM measure function 3.EXT.FREQ standard input with 9digit LED display ... MCH RF Frequency Counter,FC-3000 RF frequency counter,max.3.7GHz frequency:Specificaitons: Model SpecificationsFC-3000Display9digit large LED display, overflow ... , HOLDFrequency measurementRange 0.1Hz to 100MHz (A input), 80MHz to 3.7GHz (C input )Gate time0.01Sec, 0.1Sec, 1Sec, ...