To Measurement And Calibration Accuracy, Please The Instrument For At Least 15 Minutes. Try To Use Rf Cables And Connectors. The Calibration Cable Is Marked As It May Be Used Directly Without Calibration Next Time. The Craftsmanship Of The Test Leads Affects The Measurement Accuracy. It Is Recommended Not To Choose The Test Leads That Are Too Long. Before Measuring And Calibrating, Please Make Sure You Are Not Using Strong Wireless Signals To Avoid Interference Caused By Inaccurate Measurements. If You Don'T Understand The Impedance Measurement Itself, You Can Consult The Vector Network Analyzer'S Instructions And Tutorials. This Instrument Is Equivalent To Single-Port Vector Network Analysis. Frequency: 34.375mhz-2.7ghz Spacing: 1khz Monitor: 2.4 inches tft pixel 320x240 (qvga) - rated Capacity: 2000mah (7.4wh) Charging current: 400ma-port Charging (for charging only) - Automatic shutdown: adjustable (normally on; 5 minutes -60 minutes) Measurement : resistance/reactance/swr/s11 Resolution ratio: 4 significant figures Frequency accuracy: 55ppm Connector: SMA-K Measuring range: Impedance: 0.1~1000 (absolute impedance value); SWR: 1,000 65 65; S11 (db): 0db a-60db - Error (single point measurement): Impedance: Less than Absolute value of impedance x3 % 0.0.1 (z Less than 200200, Less than 1.5ghz) Swr: Less than Reading x10 Valid% 0.1 S11 (db/): 0.1 db/5 (0db to-10db); 1db/10 (-10db to-20db); 5db/20 (-20db to-40db) Directivity: Less than 35db (35mhz 2 ghz after calibration); Output level: -18dbm Working temperature: 0 ~ 40 Atmospheric pressure: 860hpa 101060hpa Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect e Use Colour:black Material:plastic Package Contents: 1 x Antenna Analyzer 1 x Data Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.