When unable to successfully read barcodes…
| Cause | Countermeasure | |
| 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. |
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