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# What are the individual metrics used for SEMI T10?

Below is a list of the metrics used in the SEMI T10 specification. For more detailed information on this code quality specification and its metrics, see the DataMan Communications and Programming Guide or the corresponding semi specification, which can be found at www.semi.org.

- Finder Pattern Defects is the ratio of incorrect pixels to total pixels in the finder pattern.

- Cell Defects is the ratio of incorrect pixels to total pixels in the grid.

- Vertical Mark Misplacement is the average vertical misplacement of Data Matrix marks from their optimal Data Matrix Cell Center Points.

- Horizontal Mark Misplacement is the average horizontal misplacement of Data Matrix marks from their optimal Data Matrix Cell Center Points.

- Data Matrix Cell Height is the average height of each cell in the matrix (in pixels).

- Data Matrix Cell Width is the average width of each cell in the matrix (in pixels).

- Vertical Mark Growth is the tracking of the tendency to over or under mark the symbol, that is, a vertical size comparison between the actual marked cells vs. their nominal size.

- Horizontal Mark Growth is the tracking of the tendency to over or under mark the symbol, that is, a horizontal size comparison between the actual marked cells vs. their nominal size.

- Signal To Noise Ratio (SNR) is a relative measure of the Symbol Contrast to the maximum deviation in light or dark greyscale levels in the symbol (ie. noise).

- 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.

- Symbol Contrast is the 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, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580, MX-1000, MX-1500