Features: Only be applied for Yaesu FT-857/FT-897. Clearly displays The automatic level control voltage, modulation level, standing wave ratio and supply voltage. High performance and super stability. And Easy to operate. Specifications: Material: Metal, Plastic Color: white, black Size: about 120x90x70mm Package Included: 1 PC x External S Meter/SWR/Power Meter Receive Display Settings: 1, press [FUNC] key to enter the setup menu, enable the extended menu. 2, rotate [SELECT] to call up the setup menu item No-060 [MTR ARX SEL]. 3, rotate [DIAL] to select an external instrument display: SIG: the input signal strength display CTR: Discriminator Center Meter VLT: battery voltage N / A: blank FS: buckle in the instrument 1mA full scale output signal calibration standard external instruments OFF:Turn off the meter. 4, press [FUNC] button to save the settings and exit the setup menu. Emission Display Settings: 1, press [FUNC] key to enter the setup menu, enable the extended menu. 2, rotate [SELECT] to call up the setup menu item No-061 [MTR ATX SEL]. 3, rotate [DIAL] to select an external instrument display: PWR: transmit power display ALC: Automatic Level Control voltage display MOD: Modulation Level Display SWR: SWR display VLT: Display Supply Voltage N / A: blank OFF: Turn off the meter. Calibration method is as follows: 1, press [FUNC] key to enter the setup menu, enable the extended menu. 2, rotate [SELECT] to call up the setup menu item No-060 [MTR ARX SEL]. 3, rotate [DIAL] to select FS. 4, with a small flathead screwdriver to adjust the calibration adjustment hole rear, so the header pointer to full scale. 5, the calibration is complete! NOTE: If you can not find the numbers 60, 61 menu, is this two radio hide menu. Long press the F key to open the menu settings, the 1st menu set to ON, press the F key to open the exit to save the hide menu. Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.