Denso BHT-100Q - Manual (Page 19)

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Chapter 1. Quick Guide
• Before reading 2D codes or bar codes, clean those labels if stained.
• Avoid using the BHT in direct sunlight. The BHT might fail to read correctly.
• To read 2D codes or bar codes on curved surfaces, apply the BHT to the target
code so that the code comes to the center of the scanning range indicated by the
markers.
• Depending upon the code size or cell pitch, the proper scanning distance from
2D codes or bar codes will differ.
• Do not use the BHT in the vicinity of radio equipment. The BHT may malfunction.
At the scanning time, the marker LEDs and illumination LED will come on. The
illumination LED may not come on where it is bright enough for the BHT to
scan. The light intensity of those LEDs will vary depending upon the scanning
conditions and variation of their elements.