The instrument has four interfaces: single-point measurement, scan, system information, calibration and calibration By default, the system starts to enter the single-point measurement interface. Aluminum alloy housing for extended service life. Startup and shutdown:- Hold down the CTRL key off and press the power switch button.- In the power-on state, long press the switch button (more than 2S), after releasing, the instrument will turn off Product parameters: Working frequency: 137.5MHz~2700MHz Step frequency: 1kHz Display: 2.4 inches TFT, resolution 320*240(QVGA) Power consumption 1.5W Charging current: 400mA Charging interface: USB Auto Power Off: 5 ~ 60 minutes can be set Measurement parameters: impedance, reactance, SWR and S11 Resolution: 4 digit reading Frequency accuracy: 10ppm Connector: SMA-K Impedance measurement range: 1~ 1000@frequency Less than;1300 mhz; 1~300 @frequency 1300MHz (absolute value of impedance) Standing wave measurement range: 1 ~ 65 @frequency Less than; 1300 mhz; 1 ~ 10 @frequency at 1300MHz S11 (dB) measurement range: 0dB to - 50db Error (single point measurement): Impedance: Less than; absolute value of impedance x 5%0.1 (Z Less than 200, Less than 1.5GHz) Standing wave: Less than effective reading x 10% 0.1 S11: 0.1dB/5(0dB to -10dB) For (dB/): 1dB/10(-10dB to -20dB); 5dB/20(-20dB to -40dB) Directivity: Less than; 35dB (140MHz to 2GHz after correction); Less than; 30dB (2GHz to 2.7GHz) Scan Points: 280 Output level:- 18dbm Working temperature: 0~ 40 Atmospheric pressure: 860hPa~1060hPa size: 16 x 11 x 5 cm Material: ABS colour: black Package Contents: 1 x Antenna Measuring Instrument 1 x Data cable 1 x screw pack 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.