Fangrui Product Details Rf-power-meter-v3.0 Series Is A High-performance, Low-cost Portable Usb Simple Rf Power Meter, Equipped With A 0.96-inch 160x80 Pixel Tft Full-color Display, Providing 5v Power Supply And Data Communication Through Usb Easy To Use, Compact, Easy To Carry, Stable Performance, High Accuracy, Preset Bias, Wide Dynamic Range, Fast Measurement Speed Support Sampling Speed 500us 200ms 1s; With 30db Fixed Attenuator And 4 Common Frequency Band Antennas; 315m, 433m, 900m, 2.4g/5.8ghz Antenna With Maximum Sampling And Holding Function, Better Capture Of Pulse Signals; Up To 9 Frequency Offset Calibration Data Can Be Pre-stored; The Host Computer Supports Curve Display, Chinese And English Menus, And Open Serial Port Protocol; After Parameter Setting, The Host With Tft Supports Offline Operation Mode Measurement Power Range: -55-+30 Dbm (0 To -50dbm Has Good Linearity, And Attenuator Is Required For More Than 0dbm) Measurement Power Resolution: 0.1 Dbm Measurement Frequency Range: 100k-10ghz Input Impedance: 50