... period, totalize measure, self test 3.85dB high sensitivity 4.8digits LED display Digital Frequency Meter,HC-F1000L, frequency from 10Hz~1GHz ... . 1MΩ<3pFMaximum voltage without damage: 250Vrms (DC+AC)Channel BInput sensitivity 100MHz~1GHz 20mVrms 1GHz~1.3GHz 50mVrmsImpedance Approx ... .8V “1” level: 3V~5VGeneral Display 8 digit 7mm red LED display with decimal point,gate, overflow, kHz, MHz and ...