Denso BHT-7500W Operator's Manual page 11

• Before reading bar codes, clean those labels if stained.
• Avoid using the BHT in direct sunlight. The BHT might fail to read
correctly.
• To read bar codes on curved surfaces, apply the BHT to the target bar
code so that the code comes to the center of the scanning range indicated
by the laser beam.
• When you pull the bar-code reading window away from bar codes, the
actual scanning range will become narrower than the range covered by the
laser beam.