In GS1 general spec
5.5.2.7.6 Symbol specification table 6 - Regulated healthcare non-retail consumer trade items not scanned in general distribution
Figure 5.5.2.7.6-1. GS1 system symbol specification table 6 Symbol(s) specified X-dimension mm (inches) Minimum symbol height for given X mm (inches) Quiet Zone Minimum quality specification
Minimum Target Maximum For minimum X-dimension For target X-dimension For maximum X-dimension Left Right
GS1- 128 0.170 (0.0067") 0.495 (0.0195") 0.495 (0.0195") 12.70 (0.500") 12.70 (0.500") 12.70 (0.500") 10X 10X 1.5/06/660
GS1 DataMatrix (ECC 200) (*) 0.254 (0.0100") 0.380 (0.0150") 0.495 (0.0195") Height is determined by X-dimension and data that is encoded 1X on all four sides 1.5/08/660
Sorry about the formatting but you willl get the idea - 1.5 for the average of 10 scans.
In HIBCC
5.0 Print Quality
5.1 Code 128 or Code 39
The bar code symbol quality for a Code 128 or Code 39 symbol in its final configuration shall be no lower than a
C/06/660 when measured according to ISO/IEC 15416 Information technology -- Automatic identification and data
capture techniques -- Bar code print quality test specification -- Linear symbols. Labelers should attempt to reach
B/06/660 or better at the time of printing.
5.2 Aztec Code, Data Matrix or QR Code
The bar code symbol quality for an Aztec Code, Data Matrix or QR Code symbol in its final configuration shall be no
lower than a C/06/660 when measured according to ISO/IEC 15415 Information technology -- Automatic
identification and data capture techniques -- Bar code print quality test specification -- Two-dimensional symbols.
Labelers should attempt to reach B/06/660 or better at the time of printing.
In the spirit of the UDI rule, most understand that these barcodes must be able to be read, easily and accurately as the products move through the global supply chain. That will mean using laser scanners, imagers, from manufacturers in all parts of the world. Verification is both logical and required.