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Back Ground
Reflected echo is indicated in different colors according to its strength.
Visual image of display differs from surrounding brightness. It becomes
easy to see the display by selecting different the background color.
Select Back Ground color in MENU 1: Grey, Blue, D-Blue, Black.
Pulse Width
Normally pulse width is set to short automatically according to set
displayed depth range.
Set Pulse Width on MENU 1: Short, Standard, Long.