TekPower TP3165, Intelligent Frequency Counter 0.1Hz to 2.4Ghz, with high resolution OEM Victor VC3165 Computer CPU controlled temperature compensation for high stability and Higher Resolution 8-digit LED display, clear reading and gate time adjustable continuously (100ms - 10s) Two attenuator X1 ,X 20 for up to 2.4 Ghz, Frequency measurement: 0.01Hz - 2.4 GHz , it is great counter for cellphone repair and WiFi checking Period measurement: 0.5s - 10s, Input sensitivity: 30mV(rms), Power: 110V or 220V Tekpower One Year Warranty