What do the high density and low density of bar codes mean?

The so-called high density means that it is more suitable for scanning 3mil bar codes. The higher the density of bar code, the higher the scanning performance requirements of scanning equipment.

Low density, also known as ordinary density, refers to the ordinary bar code density, such as the ordinary commodity code in the supermarket, which has a large aspect ratio, a small number and clarity. You can use a bar code scanner with normal density.