Symbol LS 4071, Product Reference Manual

Page: 29 / 168

3-3
Scanning
Hold at an Angle
Do not hold the scanner directly over the bar code. Laser light reflecting directly
back into the scanner from the bar code is known as specular reflection. This
strong light can “blind” the scanner and make decoding difficult. The area
where specular reflection occurs is known as a “dead zone.”
You can tilt the scanner up to 65° forward or back and still achieve a successful
decode. Simple practice quickly shows what tolerances to work within.
Figure 3-1. Maximum Tilt Angles and Dead Zone