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Press and hold the Locate button and slide the Joystick
left/right to change the position of vertical reading line;
up/down to increase/decrease the width of the line.
Horizontal mask
Press and hold the Locate button and slide the Joystick
up/down to change the position of the masks; left/right to
narrow/enlarge the distance between the masks.
Vertical mask
Press and hold the Locate button and slide the Joystick
left/right to change the position of the masks; up/down to
enlarge/narrow the distance between the masks.
Note: Press the Power button can close the line/mask quickly.