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# What are the individual metrics used for DotCode?

Below is a list of the metrics used for DotCode quality assessment. For more detailed information on this code quality standard and its metrics, see the DataMan Communications and Programming Guide or the corresponding ISO standard documentation, which can be found at www.iso.org.

- Grid Non-Uniformity is a measurement for the amount of placement error for the individual cells from a uniformly spaced grid as measured using the clocking pattern of a symbol.

- Unused Error Correction is the measurement for the percentage of code words left in a symbol after correcting for any errors.

  When calculating Unused Error Correction, a code word is considered to be in error if at least one of its cells is on the wrong side of the global threshold. 2D Data Matrix symbols have built-in code redundancy, or the presence of duplicate data content.

  A value of 1.00 means no errors were present in any of the code words.

- Print Growth measures the deviation of bar and space width from the intended widths (indicated in the symbology specification), that is, it measures if bars are narrower/wider compared to spaces in the symbol. The higher the difference, the lower the grade.

- Axial Non-Uniformity is the measurement of the symmetry of individual cells within the symbol, that is, the amount of deviation along the symbol's axes.

- Symbol Contrast is the value difference between the highest and lowest reflectance values in a scan (the difference in reflectance between the darkest bar and the lightest space). The grade is higher with a greater the difference

Note: DM050,DM060,DM070,DM150,DM260,DM300,DM360, DM370,DM280, DM470,DM580, DM503,MX-1000,MX-1500