Checkline DFX-7 - Manual (Page 123)

DFX-7 Ultrasonic Flaw Detector
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2) Use the UP and DOWN arrow keys to scroll through the sub menu items
until CLOSE is highlighted.
3) Press the ENTER key to close the active file. Note: Following the key
press, the CLOSE text will be grayed out indicating the file has been close
and is no longer active.