... high sensitivity 4.8digits LED display MCH Frequency Counter, HC-F1000L Frequency Counter Features Range HC-F1000C:1Hz~1GHz,Max.up ... self testHigh sensitioity:85dBV (25mVrms)Stability:±3x10-9/s8 digit LED displayGate Time:0.01s,0.1s,1sPower supply:AC ... subject to change without prior notice. HC-F1000L Frequency Counter, digital frequency counter, from 10Hz-1000MHz continuously variable, max. 1.3GHz