When unable to successfully read barcodes…
|Specular reflection||When the light is focused on the printed surface of the barcode from directly above, the BHT may not read the barcode due to specular reflection.||
Change the BHT reading angle and try again.
|Distance from barcode||The barcode may not be read if it is too close to or too far from the BHT reading window, even when the barcode is within the read area.||Move the BHT slowly away from the barcode and try again.|
|Barcode surface curvature||The barcode may not be read if its surface is extremely curved.||Read the barcode at the center of the barcode reading window.|
|Barcode surface dirt||The barcode may not be read surface is dirty.||Wipe the dirt from the barcode and try again.|
|Barcode reading window dirt||The barcode may not be read if the barcode reading window is dirty.||Blow any dust away with an airbrush, and then gently wipe the reading window with a cotton swab or similar soft object.|
|Direct sunlight, ambient light||Barcode reading may be adversely affected by direct sunlight or the brightness of the surrounding light.||Read the barcode away from direct sunlight. Adjust the brightness of the surrounding light when reading indoors.|