Metrologic Instruments TECH 7 - Manual (Page 16)

Depth of Scan Field for the MS770 Scanner
The depth of field for the scanner is 76mm to 254mm (3.00” - 10.00”)
from the laser output window. Pass the symbol through the scan area
in order for the scanner to recognize the bar code. (Refer to Figure 7)
Figure 7: MS770 Scanner, Front View
12
76 mm [3.00 in]
254 mm [10.00 in]
152 mm [6.00 in]