This inst ent has four interfaces: single point measurement, scanning, system information, correction and calibration. The default boot into single-point measurement interface. Aluminum alloy shell prolongs its service life. Note: For the convenience of the user, each time calibration correction options will automatically change to the user calibration. Meanwhile, in order to ensure the integrity of the calibration, the calibration process, the automatic shutdown function fails, the consistent boot. Attached video is to show the correct way to open the device .The buttons on the panel, 1234 from left to right, need to press 2 and 4 at the same time. Startup & Shutdown: Hold down the CTRL key off press the power switch button. The boot state, long press (2S above) the switch button, after the release, the inst ent will shut down. The boot state, long press (2S above) the switch button, after the release, the inst ent will shut down. Advice when Using: In order to ensure the accuracy of measurement and calibration, preheat the inst ent at least 15 minutes. Try to use good quality RF cable and connectors.<br><br>Model No.:PS100 Working Frequency: 137.5MHz~2.7GHz Stepped Frequency: 1kHz Display: 2.4inch TFT with resolution 320*240(QVGA) Power Consumption less than 1.5W Charging Current: 400mA Charging Port: USB Auto Power Off: Settable 5-60minutes Measured Parameters: Impedance, reactance, SWR and S11 Resolution: 4-digit readings Frequency Accuracy: less than +/- 10ppm Connector: SMA-K Impedance Measurement Range: 1 ohm~1000 ohm @frequency less than 1300MHz; 1 ohm~300 ohm @frequency more than 1300MHz (Impedance Absolute Value) Standing Wave Measurement Range: 1~65 @frequency less than 1300MHz; 1~10 @frequency more than 1300MHz S11(dB)Measurement Range: 0dB to -50dB Error (Single-point measurement): For Impedance: less than Impedance