This external multi-function expansion meter can only be applied for Yaesu FT-857D and for FT-897. With its high quality and super stability can effectively detect and understand your Yaesu FT-857, for FT-897 and improve your work efficiency. Features: High performance and super stability. Only be applied for Yaesu FT-857D and for FT-897. Clearly displays The automatic level control voltage, modulation level, standing wave ratio and supply voltage. High quality and excellent durability. Easy to operate. Specifications: Weight: 300g Size: 6.7*7*6cm Line length: 37cm Colour: Black Package List: 1 * External S Meter Display Meters for Yaesu FT-857/FT-897 FT-857D& FT-897D external header display setting method: 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-061(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 ARX 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 If you can not find the numbers 60, 61 menu, is this two radio hidden 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 hidden menu. Note: The instrument has been calibrated delivery, but do not preclude the bumps transit results in a static pointer is not zero, in this case the instrument can be adjusted at the mask-side self-zeroing screws appear black.