Voltcraft fc 2500 frequency counter 50mhz to 2 5ghz voltcraft fc 2500 the voltcraft fc 2500 frequency counter is a 50mhz to 2500mhz multifunction frequency counter with microprocessor switching in a handy pocket format can be used on battery power to stay mobile or from mains the device has a frequency range from 10 hz to 2500mhz with an excellent resolution of 0 1hz to 10mhz three measurement inputs are available with different measurement frequencies and sensitivities please see the tec