FC-3000 frequency counter: 1.Freq:max.3.7GHz 2.RPM measure ... input with 9digit LED display MCH RF Frequency Counter,FC-3000 RF frequency counter,max.3.7GHz frequency:Specificaitons: Model SpecificationsFC ... to change without prior notice. MCH RF Frequency Counter,FC-3000 RF frequency counter, max. can test to 3.7GHz