1.frequency:10Hz-1000MHz, max. 1.3Ghz 2.period, totalize measure, self test 3.85dB ... Features Range HC-F1000C:1Hz~1GHz,Max.up to 1.5GHz HC-F1000L:10Hz~1GHz,Max.up to 1.8GHzPeriod,totalize measurement ... Frequency Counter, digital frequency counter, from 10Hz-1000MHz continuously variable, max. 1.3GHz