front reference & trailing reference
Press the button on the bottom right to switch reference point.
A fiducial icon will appear in the upper left corner of the LCD backlight. Before measuring, please confirm which reference mode the current rangefinder is in.
In front reference mode, the measurement result will not consider its own length. In the rear reference mode, the measurement result will automatically consider its own length.
The length of laser measure itself is approximately 0.387ft.