To Ensure Accurate Measurements And Calibrations, Allow The Instrument To Warm Up For At Least 15 Minutes.   Try To Use Good Quality Rf Cables And Connectors.   The Cable Marked With Calibration May Not Need To Be Calibrated Next Time And Can Be Used Directly.   The Technology Of The Test Leads Affects The Measurement Accuracy. It Is Recommended Not To Choose Too Long Test Leads.   Before Measuring And Calibrating, Please Ensure That You Are In An Environment With Strong Wireless Signals To Avoid Interference Caused By Inaccurate Measurements. If You Don'T Understand The Impedance Measurement Itself, You Can Consult The Instruction Manual And Tutorial Of The Vector Network Analyzer. This Instrument Is Equivalent To A One-Port Vector Network Analysis.      Specification:    Frequency: 34.375mhz-2.7ghz   Pitch: 1khz   Display: 2.4 Inches 320x240 Tft Pixels (Qvga) - Nominal   Capacity: 2000mah (7.4wh)   Power Consumption: Less than1.5w -   Charging Current: 400ma   Charging Port: Usb (For Charging Only)   Auto Power Off: Adjustable (Always On; 5 Min 60 60 Min) -   Measured Data: Resistance/Reactance/Swr/S11 - Resolution:    4 Significant Figures - Frequency   Accuracy: 55ppm - Connector   : Sma-K-   Measuring Range:    Impedance: 0.1Ω~1000Ω (Absolute Impedance Value);    Swr: 1000 65 65   S11(Db): 0db To-60db   Error (Single Point Measurement):    Impedance: Less thanAbsolute Value Of Impedance X3 % 0.0.1ω (Z Less than200200, Less than1.5ghz)   Swr: Less thanReading X10 Effective% ±0.1   S11 (Db/°): 0.1 Db/5° (0db To -10db); 1db/10° (-10db To -20db); 5db/20° (-20db To -40db)   size: 98 x 86 x 30mm   Material: ABS   colour: black      Package Contents:    1 x Vector Antenna Analyzer Instrument   1 x Wire