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Operation
Keyboard
POWER
Turn the power supply on/off.
BACKLIGHT
Adjust the LCD backlight.
MENU
Press【MENU】to display the menu items. Then select a particular option.
Using the 【▲】or【▼】, and use【 】or【 】to adjust the setting value.
Press【MENU】again to save the setting and quit from menu.
RANGE
【RANGE▲】 & 【RANGE▼
Press the range key to adjust the range manually.
Range scope: 4 8 24 40 56 80 120 160 200 240 280m.
GAIN
【GAIN】+&【GAIN-】
In single frequency model, press 【GAIN+】 or 【GAIN-】 to adjust the gain
value for the clearest echo.
In dual frequency model, press 【GAIN+】 or 【GAIN-】 to adjust the gain
value of dual frequencies simultaneously.
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