Focus Lock Label (Optional) - Datalogic Matrix 120 Product Reference Manual

See Chapter 6

Focus Lock Label (optional)

There are five single-use focus lock labels included in the packaging that can be
use to protect the focus position from being changed after the application has
been completed.
These are adhesive labels that are designed to be applied over the focus screw as
shown in the figure below.
Product Reference Guide
Linear Barcode Reading
2D Code Reading
Figure 33 - Tilt Angle Considerations
for FOV vs. Reading Distance considerations.
Focus Lock Label (optional)
53