... , self test 3.85dB high sensitivity 4.8digits LED display Frequency Meter,HC-F1000L, frequency from 10Hz~1GHz,digital display Model F1000CFrequency measurementsChannel ARange ... : 0V~0.8V “1” level: 3V~5VGeneral Display 8 digit 7mm red LED display with decimal point,gate, overflow, kHz, MHz and ... prior notice. HC-F1000C frequency meter,10Hz to 1GHz frequency, digital display