... totalize measure, self test 3.85dB high sensitivity 4.8digits LED display MCH Frequency Counter, HC-F1000L Frequency Counter Features Range ... 10Hz~1GHz,Max.up to 1.8GHzPeriod,totalize measurement self testHigh sensitioity:85dBV (25mVrms)Stability:±3x10-9/s8 ... to change without prior notice. HC-F1000L Frequency Counter, digital frequency counter, from 10Hz-1000MHz continuously variable, max. 1.3GHz ...