Juniper mesa 2 Owner's Manual page 36

Home Screen
From the home screen, select your preferred Startup option.
You can also do a Scan Test with the current settings.
Note: When you do a Scan Test, tap the Scan button on the
screen. You can also use the scan button on the Mesa 2 (P2
is the default). Put the cursor in the Scan Data box first. After
a successful scan, the Barcode Scan Symbology and Scan
Data are shown on the screen.
Barcode Setup
Select the menu symbol in the upper left hand corner.
From this menu, select User to set up the User Settings. From
this screen, set up options like which button you would like
to use to scan barcodes (P2 is the default).
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Mesa 2 Rugged Tablet Owner's Manual