Datavideo WM-11, Инструкция по эксплуатации

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1. First mount a bubble level meter to the wall plate using two M2.5
screws. Align the wall plate with the four holes drilled in Pre-Work
then use four expansion bolts to secure the wall plate.
See the
diagram below .
Please note that you can use the bubble level meter to make sure
that the wall plate is properly aligned. If the bubble is at the center,
the wall plate is horizontally aligned (perfectly levelled). If the bubble
is on either side, the wall plate is tilted to the sides.