Gain Express VC3165 Radio Frequency Counter RF Meter 0.01Hz~2.4GHz Professional Tester With 3 steps function selection: work state, unit & 8-digit LED display Frequency measurement from 0.01 Hz to 2.4 GHz Cyclic measuring range from 0.5 ms to 10 s With attenuation of 20 dB and input impedance of 1 MO With frequency, period and equal-precision measurement