Sensors & Software Inc. NG250 ユーザーズマニュアル

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Noggin
11-Locate & Mark Mode
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11.5 Changing the Date and Time
From the System Settings Screen, select the Date option.  The Time option is similar.
Use the Left and Right Arrow buttons to highlight the number to change in red.  
Increase the number using the Up Arrow and decrease the number using the Down Arrow.
Pressing OK saves the new date or time and exits the screen.  
Pressing Cancel exits the screen without saving the date or time.